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nt1 16 0 mar 12 , 201 6 page 1 of 22 rev 1 . 0 0 NT1160 datasheet nuvoton touch key series nt1 16 0 datasheet the information described in this document is the exclusive intellectual property of nuvoton technology corporation and shall not be reproduced without permission from nuvoton. nuvoton is providing this document only for reference purposes of numicro microcontroller based system design. nuvoton assumes no responsibility for errors or omissions. all data and specifications are s ubject to change without notice. for additional information or questions, please contact: nuvoton technology corporation. www.nuvoton.com
nt1 16 0 mar 12 , 201 6 page 2 of 22 rev 1 . 0 0 NT1160 datasheet table of content s 1 general description ................................ ................................ ................ 4 2 features ................................ ................................ ............................. 5 3 pin diagram ................................ ................................ ......................... 6 4 capacitive touch key ................................ ................................ ............. 7 input circuit ................................ ................................ ............................. 7 4.1 sensor pad and ground for pcb layout ................................ .......................... 8 4.2 sensor pad size ................................ ................................ ....................... 8 4.3 5 i 2 c interface ................................ ................................ ....................... 10 byte - write ................................ ................................ .............................. 10 5.1 random - read ................................ ................................ ......................... 10 5.2 continuous - read ................................ ................................ ..................... 11 5.3 i 2 c circuit ................................ ................................ .............................. 11 5.4 6 i 2 c data definition ................................ ................................ ............... 12 memory address ................................ ................................ ...................... 12 6.1 address 0x00: product no. ................................ ................................ .......... 13 6.2 address 0x01: button no. ................................ ................................ ........... 13 6.3 address 0x02: version no. ................................ ................................ .......... 13 6.4 address 0x03: i 2 c device address ................................ ................................ 14 6.5 address 0x04: system control bits ................................ ................................ 14 6.6 address 0x06: output mode settings ................................ ............................. 14 6.7 address 0x07: sense pin enable 1 ................................ ................................ 15 6.8 address 0x08: sense pin enable 2 ................................ ................................ 15 6.9 address 0x0c: de - bounce ................................ ................................ .......... 15 6.10 address 0x0e: sensor cycle ................................ ................................ ....... 15 6.11 address 0x0f: calibration delay ................................ ................................ ... 15 6.12 address 0x10: status. ................................ ................................ ................ 15 6.13 address 0x11: key status 1 ................................ ................................ ......... 15 6.14 address 0x12: key status 2 ................................ ................................ ......... 16 6.15 address 0x15: 7 segment led display ................................ ........................... 16 6.16 address 0x20~0x2f: trigger level ................................ ................................ 16 6.17 address 0x40~0x5f: sensor value ................................ ................................ 16 6.18 7 reference schematic ................................ ................................ ............ 18
nt1 16 0 mar 12 , 201 6 page 3 of 22 rev 1 . 0 0 NT1160 datasheet 8 electrical characteristics ................................ ................................ ........ 19 absolute maximum ratings ................................ ................................ ......... 19 8.1 dc electrical characteristics ................................ ................................ ........ 19 8.2 9 package dimension ................................ ................................ .............. 20 tssop20 C 4.4x6.5mm ................................ ................................ ............. 20 9.1 10 revision history ................................ ................................ ............ 21
nt1 16 0 mar 12 , 201 6 page 4 of 22 rev 1 . 0 0 NT1160 datasheet 1 general description the nuvoton touch key series, NT1160, provides an easy - to - implement touch key interface solution and supports configurable 16 touch button application s, 3 - channel led output, and multi - key input mode configuration, such as single touch key , m ulti - keys and toggle function to enable the shortest development cycle. through the i 2 c bus implemented by an external device, the NT1160 can be controlled to handle chip performance precisely. there is nearly no special requirement for application board circuit design, and no need to design special ground net or other protection s for the key pad. the NT1160 provides excellent anti - static capability and immunity to eft . it also supports outstanding immunity to emi from mobile phone or walkie - talkie applications. that is to say, the NT1160 provides a comprehensive response to a variety of applications. the NT1160 is suitable for a wide range of applications, such as audio pa nel, telephone keyboard, instrument control panel, wash er control panel, access control system control panel, household appliances and various small appliances (cooker, disinfection cabinet, microwave, etc.). almost all applications related to the control panel key operation can be used.
nt1 16 0 mar 12 , 201 6 page 5 of 22 rev 1 . 0 0 NT1160 datasheet 2 feature s ? support 16 capacitive touch keys ? support 3 led driver ? output mode s : ? led display ? i2c ? water r esistant or water - droplet operation ? w ater - droplet operation without action error s ? key lock function ? resist electromagnetic interference ? resist ance to electromagnetic radiation of mobile phones ? multiple touch key output selection ? single touch key/ multi - keys function selectable ? key lock function ? p rompt output function selectable ? i2c parameter setting s ? touch key trigger level f or each key ? touch key de - bounce for each key ? a uto calibration interval ? operating voltage: 2.4v ~ 5.5v ? operating current: 1.8ma ~ 2.3ma ? operating temperature: - 40 ~ + 85 ? touch key response time: 51 ms
nt1 16 0 mar 12 , 201 6 page 6 of 22 rev 1 . 0 0 NT1160 datasheet 3 pin diagram figure 3 - 1 tssop20 pin diagram no. pin name description 1 sen1 touch key - 1 input pin. 2 out1 led output pin 1 3 out2 led output pin 2 4 - rst ic reset pin. 5 v ss ground pin. 6 - act touch key active indicator 7 - chg touch key status change indicator 8 out 3 led output pin 3 9 sda data pin of i2c bus 10 scl clock pin of i2c bus 11 cp2 touch key driving signal 2 12 cp1 touch key driving signal 1 13 sen8 touch key - 8 input pin. 14 sen7 touch key - 7 input pin. 15 v dd power supply pin. 16 sen6 touch key - 6 input pin. 17 sen5 touch key - 5 input pin. 18 sen4 touch key - 4 input pin. 19 sen3 touch key - 3 input pin. 20 sen2 touch key - 2 input pin. table 3 - 1 pin description 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 s e n 1 o u t 1 o u t 2 o u t 3 - r s t v s s - a c t - c h g s d a s c l c p 2 c p 1 v d d s e n 8 s e n 7 s e n 6 s e n 5 s e n 4 s e n 3 s e n 2 2 0 p i n
nt1 16 0 mar 12 , 201 6 page 7 of 22 rev 1 . 0 0 NT1160 datasheet 4 capacitive touch key input circuit 4.1 each capacitive touch key needs to be connected with one resistor as shown in figure 4 - 1 . it is strongly recommended that the r esistor value is 390 k and the capacitor value is 4.7pf . at the same time, all the resistors need to be kept as close to sensor pad as possible during pcb layout. figure 4 - 1 touch k ey reference circuit t here are t wo touch key driving signals (cpn) for nt1 160 to operat e matrix scan. one sin pin can distinguish two touch key s through the driving signal as shown in figure 4 - 2 . figure 4 - 2 scanning touch key reference circuit t o u c h p a d 4 . 7 p f 3 9 0 k c p n s e n n
nt1 16 0 mar 12 , 201 6 page 8 of 22 rev 1 . 0 0 NT1160 datasheet sensor pad and ground for pcb layout 4.2 the size of sensor pad, using circular shape with diameter equal or greater than 8mm is recommended. actually, sensor pad could be any kinds of shape, but fulfilling finger size is suitable. extra ground - net around sensor pads is not needed for pcb artwork. however, ground - net along sensor pad to chip is alternative. figure 4 - 3 shows that the pcb line width of sensor pad to chip should be 0.254mm (10mil) or less and to keep distance with ground at least 1mm. the other layer of pcb could implement ground - net for pcb artwork to block noise interfering with signal line. all the subsidiary components need to be kept as close to sensor pad as possible at pcb layout. meanwhile, the touch key chip ( nt1 160 ) and touch pad located on the same pcb board would be better. figure 4 - 3 sensor pad and ground - net as shown in figure 4 - 4 , a spring attached to the metal - panel can be used as a sensor pad. it is recommend ed that the metal - panel (ring) should be adhere d to the inside of cover to be an effective sensing area. if u ser wants to add a led in the middle of sensor pad, the measure of sensor area should be increased to compensate the hollowing part and keeping the same sensitivity. figure 4 - 4 spring with s olid m etal p lane / r ing sensor pad size 4.3 the size of sensor pad plays a significant role in determining the thickness of panel. the greater area of a sensor pad is, the deeper a touch signal could be detected. table 4 - 1 shows the relation ship between the pad size and panel thickness. size of sensor pad panel thickness ( recommended v alue) sensor pad gnd gnd 0 . 254 mm ( 10 mil ) > 1 mm > 1 mm
nt1 16 0 mar 12 , 201 6 page 9 of 22 rev 1 . 0 0 NT1160 datasheet 8 mm x 8 mm 2.0 mm 10 mm x 10 mm 3.0 mm 15 mm x 15 mm 4.5 mm 20 mm x 20 mm 6.0 mm table 4 - 1 sensor pa d and correspond ing panel thickness
nt1 16 0 mar 12 , 201 6 page 10 of 22 rev 1 . 0 0 NT1160 datasheet 5 i 2 c interface the maximum speed of i 2 c serial interface could be up to 400kbps and it will not send any signal in an active way to main controller since it is i 2 c slave. the i 2 c interface is not working in normal operation time. to enter i 2 c serial mode, user must connect v dd to sel pin and then make chip power - on. u ser could easily set the touch related parameter and adjust the sensitivity by us ing the i 2 c interface . the i 2 c transmission provides three modes: byte - write, random - read and continu ous - read . byte - write 5.1 the data protocol includes 3 bytes from master writing data to salve. the first byte for device address, the second byte for memory address and the third byte is for the write data. figure 5 - 1 shows the detail about byte - write action. figure 5 - 1 byte - write mode in normal time s , sda and scl will be kep t as logic 1. for the start signal, sda will change to logic 0 first then scl to logic 0 as well. when transmitting , data is prepared on sda signal an d then scl will change to logic 1. slave reads the byte data based on the rising edge of scl signal. slave will send logic 0 on the 9 th clock signal to indicate receiving the byte data. for the stop signal, master device will change scl to logic 1 and then sda to 1, when the transmission of 3 bytes of inf ormation is finished. random - read 5.2 this is a 4 - byte data combination when master read s slave. figure 5 - 2 shows that the first byte is used as device address and write - status; the second byte is used as memory address; the third byte is used as device address and read - status and the fourth byte is used as slave output data with master keeping sending the scl clock signal. figure 5 - 2 random - read mode b y t e 1 d e v i c e a d d r e s s s t a r t w r i t e a c k b y t e 2 m e m o r y a d d r e s s a c k b y t e 3 d a t a a c k s t o p s d a s c l b y t e 1 d e v i c e a d d r e s s s t a r t w r i t e a c k b y t e 2 m e m o r y a d d r e s s a c k b y t e 4 d a t a n a c k s t o p s d a s c l b y t e 3 d e v i c e a d d r e s s r e a d a c k s t a r t s t o p
nt1 16 0 mar 12 , 201 6 page 11 of 22 rev 1 . 0 0 NT1160 datasheet after the 2 nd byte data transmission is complete , t he s tart signal is needed before sending the next 3 rd byte data. the scl signal will change to logic 0 when 3 rd byte data transmission is done . scl signal will be released till 4 th output data is ready. the first h ost could send logic 1 on scl and monitor scl changing to logic 1 to receive 1 st bit. note that master should send a logic 1, nack signal, on the 9 th clock signal of the 4 th byte. continu ous - read 5.3 this is a 4 - byte data combination when master continually read s slave. figure 5 - 3 shows that the first byte as device address and write - status; the second byte as memory address; the third byte as device address and read - status. from the fourth byte, slave will keep output data with master keeping sending ack and scl clock signal. the memory address will be automatically increased. figure 5 - 3 continu ous - read mode i 2 c circuit 5.4 the i 2 c pins are sda and scl with open - drain mode which requires pull - high resistor on the i 2 c bus . figure 5 - 4 i 2 c b us connection b y t e 1 d e v i c e a d d r e s s s t a r t w r i t e a c k b y t e 2 m e m o r y a d d r e s s a c k b y t e 4 d a t a 1 a c k s d a s c l b y t e 3 d e v i c e a d d r e s s r e a d a c k s t a r t . . . b y t e d a t a n n a c k s t o p s t o p h o s t n u - t o u c h o t h e r d e v i c e s d a s c l s d a s c l s d a s c l s d a s c l r u p r u p v d d
nt1 16 0 mar 12 , 201 6 page 12 of 22 rev 1 . 0 0 NT1160 datasheet 6 i 2 c data definition memory address 6.1 table 6 - 1 shows the memory address of i 2 c starting from 0x00~0x4f with specific function on each address. r: read only, r/w: read / write, (b)r: must be set build bit, and user can read only. (b)r/w: must be set to build bit, and user can read and write. address r/w description default 0x00 r product number 0x3e 0x01 r shows how many buttons supported. 0x16 0x02 r version number 0x31 0x03 r/w i 2 c device address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 a 7 a6 a5 a4 a3 a2 a1 0 0x60 0x04 r/w system control bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 reset x x x auto calibrate x build 0x08 0x06 r/w output mode bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 multi x x x lock en - any 0 x 0x04 0x07 (b)r/w sense pin enable 1 bit7 bi t 6 bit5 bit4 bit3 bit2 bit1 bit0 sen8 sen7 sen6 sen5 sen4 sen3 sen2 sen1 0xff 0x08 (b)r/w sense pin enable 2 0xff 0x0c (b)r/w de - bounce (range: 1~7) 0x03 0x0e (b)r/w sensor cycle (range: 3~15) 0x07 0x0f (b)r/w calibration delay (range: 7~63) 0x32 0x10 r status bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 any - act b - change 0 0 0 0 0 0 0x00
nt1 16 0 mar 12 , 201 6 page 13 of 22 rev 1 . 0 0 NT1160 datasheet 0x11 r key status 1 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 sen8 sen7 sen6 sen5 sen4 sen3 sen2 sen1 0x00 0x12 r key status 2 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 sen16 sen15 sen14 sen13 sen12 sen11 sen10 sen9 0x00 0x15 r/w led control bit7 bit6 b it5 bit4 bit3 bit2 bit1 bit0 0 0 0
0 0 out3 out2 out1 0x00 0x20~0x2 f (b)r/w trigger level (range: 3~63) 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 sen1 sen2 sen3 sen4 sen5 sen6 sen7 sen8 0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f sen9 sen10 sen11 sen12 sen13 sen14 sen15 sen16 0x12 0x40~0x 5 f (b)r sensor value 0x40 0x41 0x42 0x43 0x 4 4 0x45 0x46 0x47 sen1 sen2 sen3 sen4 0x48 0x49 0 x 4a 0x4b 0x4c 0x4d 0x4e 0x4f sen5 sen6 sen7 sen8 0x50 0x51 0x52 0x53 0x54 0x55 0x56 0x57 sen9 sen10 sen11 sen12 0x58 0x59 0x5a 0x5b 0x5c 0x5d 0x5e 0x5f sen13 sen14 sen15 sen16 0x0000 table 6 - 1 i 2 c memory address definition and description address 0x00 : product n o . 6.2 for p roduct identification us e. address 0x01 : button n o . 6.3 for p roduct identification us e. address 0x02 : version n o . 6.4
nt1 16 0 mar 12 , 201 6 page 14 of 22 rev 1 . 0 0 NT1160 datasheet for product identification us e. address 0x03 : i 2 c d evice a ddress 6.5 the d efault address is 0x60 , including read/write 8 - bit address. the device address could be changed by the i 2 c interface. when changing the device address, the latest device address must be used in the next read/write action. address 0x04 : system c ontrol b its 6.6 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 reset x x x auto calibrate x build reset : software reset. chip could be reset by writing auto : auto calibration. write calibrate : calibration enabled. user could set this bit to enable calibration procedure and this bit will return to build : test mode. 1 = read related sensor parameter and data to provide test and analysis function. 0 = hide some parameter which has nothing to do with operation action to prevent parameter being changed accidentally. address 0x06 : output m ode s ettings 6.7 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 multi 0 0 0 lock en - any 0 0 multi : multi - key output. 1 = output multi - key status simultaneously 0 = output the key status with greatest signal lock : lock. 1 = if two or more keys are triggered, all output will be locked and no any output signal happened . en - any : enable - act pin. 1 = enable - act pin function. any pressed key will make the - act pin output low level signal. the - act pin will return to high level when no key is pressed.
nt1 16 0 mar 12 , 201 6 page 15 of 22 rev 1 . 0 0 NT1160 datasheet address 0x07 : sense pin enable 1 6.8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 sen8 sen7 sen6 sen5 sen4 sen3 sen2 sen1 sen8~sen1 : enable sense pin . 1 = enable correspond ing key 0 = disable correspond ing key address 0x0 8: sense pin enable 2 6.9 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 sen 16 sen 15 sen 14 sen 13 sen 12 sen 11 sen 10 sen 9 sen 16 ~sen 9 : enable sense pin . 1 = enable correspond ing key 0 = disable correspond ing key address 0x0c : de - bounce 6.10 the value is from 1 to 7. set this parameter to avoid key output bouncing. the k ey will react slower with less chance of bouncing if this value is set higher . address 0x0e : sensor cycle 6.11 the value is from 3 to 15. the captures data will be more stable and key react slower if this value is set higher. address 0x0f : calibration delay 6.12 the value is from 7 to 63. it defines how long the chip will do re - calibration process again. this bit is valid if auto bit is set to 1 . address 0x10 : status. 6.13 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 any - act b - change 0 0 0 0 0 0 any - act : this bit will be set to b - change : this bit will be set to address 0x11 : key s tatus 1 6.14 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 sen8 sen7 sen6 sen5 sen4 sen3 sen2 sen1
nt1 16 0 mar 12 , 201 6 page 16 of 22 rev 1 . 0 0 NT1160 datasheet sen8~sen1 : 1 = corresponding key is pressed. 0 = corresponding key is released. reading status here will ignore the setting in o utput mode. address 0x1 2: key s tatus 2 6.15 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 sen 16 sen 15 sen 14 sen 13 sen 12 sen 11 sen 10 sen 9 sen 16 ~sen 9 : 1 = corresponding key is pressed. 0 = corresponding key is released. reading status here will ignore the setting in o utput mode. address 0x15 : 7 segment led display 6.16 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0 0 0 0 0 out3 out2 out1 out8~out1 : corresponding to pin out 3 ~ out1 . 1 = pin output high. 0 = pin output low. address 0x20 ~ 0x 2 f : trigger level 6.17 the value is from 3 to 63. this bit is to set trigger level individually to eliminate the sensitivity difference on each touch key sensor. the lower value user set will get higher sensitivity but lower stability. address 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 sensor sen1 sen2 sen3 sen4 sen5 sen6 sen7 sen8 address 0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f sensor sen9 sen10 sen11 sen12 sen13 sen14 sen15 sen16 address 0x40 ~ 0x 5 f : sensor value 6.18 the value shows the reading sampling result which is from 0 to 1023. the data format is msb first, then lsb. address 0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47 sensor sen1 - hi sen1 - lo sen2 - hi sen2 - lo sen3 - hi sen3 - lo sen4 - hi sen4 - lo address 0x48 0x49 0x4a 0x4b 0x4c 0x4d 0x4e 0x4f sensor sen5 - hi sen5 - lo sen6 - hi sen6 - lo sen7 - hi sen7 - lo sen8 - hi sen8 - lo
nt1 16 0 mar 12 , 201 6 page 17 of 22 rev 1 . 0 0 NT1160 datasheet address 0x50 0x51 0x52 0x53 0x54 0x55 0x56 0x57 sensor sen9 - hi sen9 - lo sen10 - hi sen10 - lo sen11 - hi sen11 - lo sen12 - hi sen12 - lo address 0x58 0x59 0x5a 0x5b 0x5c 0x5d 0x5e 0x5f sensor sen13 - hi sen13 - lo sen14 - hi sen14 - lo sen15 - hi sen15 - lo sen16 - hi sen16 - lo
nt1 16 0 mar 12 , 201 6 page 18 of 22 rev 1 . 0 0 NT1160 datasheet 7 reference schematic n t 1 1 6 0 k e y 1 3 9 0 k 4 . 7 p s e n 1 s e n 2 s e n 3 s e n 4 s e n 5 s e n 6 s e n 7 s e n 8 c p 1 v s s v d d 0 . 1 u o u t 1 o u t 2 o u t 3 - a c t - c h g s d a s c l - r s t v d d 3 3 r 1 0 0 r 1 0 u v d d s d a s c l v d d v d d v d d 3 k 3 3 k 3 k e y 2 3 9 0 k 4 . 7 p k e y 3 3 9 0 k 4 . 7 p k e y 4 3 9 0 k 4 . 7 p k e y 5 3 9 0 k 4 . 7 p k e y 6 3 9 0 k 4 . 7 p k e y 7 3 9 0 k 4 . 7 p k e y 8 3 9 0 k 4 . 7 p c p 2 k e y 9 3 9 0 k 4 . 7 p k e y 1 0 3 9 0 k 4 . 7 p k e y 1 1 3 9 0 k 4 . 7 p k e y 1 2 3 9 0 k 4 . 7 p k e y 1 3 3 9 0 k 4 . 7 p k e y 1 4 3 9 0 k 4 . 7 p k e y 1 5 3 9 0 k 4 . 7 p k e y 1 6 3 9 0 k 4 . 7 p 1 0 u v d d
nt1 16 0 mar 12 , 201 6 page 19 of 22 rev 1 . 0 0 NT1160 datasheet 8 electrical character istic s absolute maximum ratings 8.1 parameter range unit operating temperature - 40 to +85 ? c storage temperature - 55 to +150 ? c v dd to v ss voltage - 0.3 to +6.5 v other pin to v ss voltage - 0.3 to (v dd +0.3) v dc electrical characteristic s 8.2 parameter symbol condition min. typ. max. unit o p erating voltage v dd --- 2.4 - 5.5 v o p erating current i dd v dd = 5v - 2.30 - ma v dd = 3v - 1.93 - ma input low voltage v il 2.4v nt1 16 0 mar 12 , 201 6 page 20 of 22 rev 1 . 0 0 NT1160 datasheet 9 package dimension tssop 20 C 4.4x6.5mm 9.1
nt1 16 0 mar 12 , 201 6 page 21 of 22 rev 1 . 0 0 NT1160 datasheet 10 revision history date rev ision description 201 6 . 03 . 12 1.0 0 preliminary version
nt1 16 0 mar 12 , 201 6 page 22 of 22 rev 1 . 0 0 NT1160 datasheet important notice nuvoton products are neither intended nor warranted for usage in systems or equipment, any malfunction or failure of which may cause loss of human life, bodily injury or severe property damage. such applications are deemed, insecure usage. insecure usag e includes, but is not limited to: equipment for surgical implementation, atomic energy control instruments, airplane or spaceship instruments, the control or operation of dynamic, brake or safety systems designed for vehicular use, traffic signal instrume nts, all types of safety devices, and other applications intended to support or sustain life. all insecure usage shall be made at customers risk, and in the event that third parties lay claims to nuvoton as a result of customers insecure usage, custome r shall indemnify the damages and liabilities thus incurred by nuvoton.

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