Command Byte - Advantech ITA-5831 Series User Manual

For ITA-5831, the I/O address of the above SMB_BASE is 0xF040. The correspond-
ing SMBUS slave address of PCA9554 for GPIO 00 ~ GPIO 07 on ITA-5831 is 0x40
(8 bit address).
GPIO 00 ~ GPIO 07: PCA9554 0x40 (IO0 ~ IO7)
Table 6.2: Pin Definitions
PinDIP16, SO16,
Symbol
SSOP16, TSSOP16
A0 1
A1 2
A2 3
IO0 4
IO1 5
IO2 6
IO3 7
VSS 8
IO4 9
IO5 10
IO6 11
IO7 12
INT 13
SCL 14
SDA 15
VDD 16
n.c. -
6.2.1

Command Byte

Table 6.3: Command Byte
Command
0
1
2
3
The command byte is the first byte to follow the address byte during a write transmis-
sion. It is used as a pointer to determine which of the following registers will be writ-
ten or read. PCA9554 has a total of four registers to control GPIO.
HVQFN16
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
-
Protocol
Read byte
Read/Write byte
Read/Write byte
Read/Write byte
65
SSOP20 Description
6 Address input 0
7 Address input 1
9 Address input 2
10 Input/output 0
11 Input/output 1
12 Input/output 2
14 Input/output 3
15 Supply ground
16 Input/output 4
17 Input/output 5
19 Input/output 6
20 Input/output 7
1 Interrupt output (open-drain)
2 Serial clock line
4 Serial data line
5 Supply voltage
3,8,13,18 Not connected
Function
Input port register
Output port register
Polarity inversion register
Configuration register
ITA-5831 User Manual