TCA8418E_15 Datasheet, PDF (25/50 Pages) Texas Instruments – I2C Controlled Keypad Scan IC With Integrated ESD Protection

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TCA8418E
SCPS222C – MAY 2010 – REVISED OCTOBER 2015
8.6 Register Maps
8.6.1 Device Address
The address of the TCA8418E is shown in Table 8.
Table 8. TCA8418E Device Addresses
BYTE
BIT
7 (MSB)
6
5
4
3
2
I²C slave address
0
1
1
0
1
0
1
0 (LSB)
0
R/W
The last bit of the slave address defines the operation (read or write) to be performed. A high (1) selects a read
operation, while a low (0) selects a write operation.
8.6.2 Control Register and Command Byte
Following the successful acknowledgment of the address byte, the bus master sends a command byte, which is
stored in the control register in the TCA8418E. The command byte indicates the register that will be updated with
information. All registers can be read and written to by the system master.
Table 9 shows all the registers within this device and their descriptions. The default value in all registers is 0.
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