TCA8418E_15 Datasheet, PDF (32/50 Pages) Texas Instruments – I2C Controlled Keypad Scan IC With Integrated ESD Protection

TCA8418E
SCPS222C – MAY 2010 – REVISED OCTOBER 2015
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8.6.2.6 Unlock1 and Unlock2 Registers, UNLOCK1/2 (Address 0x0F-0x10)
ADDRESS
0x0F
0x10
Table 15. Unlock1 and Unlock2 Register Field Descriptions
REGISTER NAME
Unlock1
Unlock2
BIT
REGISTER DESCRIPTION
7
6
5
4
3
2
1
0
Unlock key 1
UK1_7 UK1_6 UK1_5 UK1_4 UK1_3 UK1_2 UK1_1 UK1_0
Unlock key 2
UK2_7 UK2_6 UK2_5 UK2_4 UK2_3 UK2_2 UK2_1 UK2_0
UK1[6:0] contains the key number used to unlock key 1
UK2[6:0] contains the key number used to unlock key 2
A ‘0’ in either register will disable the keylock function.
8.6.2.7 GPIO Interrupt Status Registers, GPIO_INT_STAT1–3 (Address 0x11–0x13)
These registers are used to check GPIO interrupt status. If the GPI_INT bit is set in INT_STAT register, then the
GPI which set that interrupt will be marked with a 1 in the corresponding table. To clear the GPI_INT bit, these
registers must all be 0x00. A read to the register will clear it.
ADDRESS
0x11
0x12
0x13
Table 16. GPIO Interrupt Status Register Field Descriptions
REGISTER NAME
GPIO_INT_STAT1
GPIO_INT_STAT2
GPIO_INT_STAT3
REGISTER DESCRIPTION
GPIO Interrupt Status 1
GPIO Interrupt Status 2
GPIO Interrupt Status 3
7
R7IS
C7IS
N/A
6
R6IS
C6IS
N/A
5
R5IS
C5IS
N/A
BIT
4
3
R4IS R3IS
C4IS C3IS
N/A N/A
2
R2IS
C2IS
N/A
1
R1IS
C1IS
C9IS
0
R0IS
C0IS
C8IS
8.6.2.8 GPIO Data Status Registers, GPIO_DAT_STAT1–3 (Address 0x14–0x16)
These registers show the GPIO state when read for inputs and outputs. Read these twice to clear them.
ADDRESS
0x14
0x15
0x16
Table 17. GPIO Data Status Register Field Descriptions
REGISTER NAME
GPIO_DAT_STAT1
GPIO_DAT_STAT2
GPIO_DAT_STAT3
REGISTER DESCRIPTION
GPIO Data Status 1
GPIO Data Status 2
GPIO Data Status 3
7
R7DS
C7DS
N/A
6
R6DS
C6DS
N/A
5
R5DS
C5DS
N/A
BIT
4
3
R4DS R3DS
C4DS C3DS
N/A N/A
2
R2DS
C2DS
N/A
1
R1DS
C1DS
C9DS
0
R0DS
C0DS
C8DS
8.6.2.9 GPIO Data Out Registers, GPIO_DAT_OUT1–3 (Address 0x17–0x19)
These registers contain GPIO data to be written to GPIO out driver; inputs are not affected. This sets the output
for the corresponding GPIO output.
ADDRESS
0x17
0x18
0x19
Table 18. GPIO Data Out Register Field Descriptions
REGISTER NAME
GPIO_DAT_OUT1
GPIO_DAT_OUT2
GPIO_DAT_OUT3
REGISTER DESCRIPTION
GPIO Data Out 1
GPIO Data Out 2
GPIO Data Out 3
7
R7DO
C7DO
N/A
6
R6DO
C6DO
N/A
5
R5DO
C5DO
N/A
BIT
4
3
R4DO R3DO
C4DO C3DO
N/A N/A
2
R2DO
C2DO
N/A
1
R1DO
C1DO
C9DO
0
R0DO
C0DO
C8DO
8.6.2.10 GPIO Interrupt Enable Registers, GPIO_INT_EN1–3 (Address 0x1A–0x1C)
These registers enable interrupts (bit value 1) or disable interrupts (bit value '0') for general purpose inputs (GPI)
only. If the input changes on a pin which is setup as a GPI, then the GPI_INT bit will be set in the INT_STAT
register.
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