stmpe1801 STMicroelectronics, stmpe1801 Datasheet - Page 14

• Manufacturer Part Number: stmpe1801
• Description: Xpander Logic? 18-bit Enhanced Port Expander With Keypad Controller
• Manufacturer: STMicroelectronics

I2C specification
6
6.1
6.2
6.3
6.4
14/60
I
The features supported by the I
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The device supports both 1.8 V I
Vpullup at SCL and SDA externally is greater or equal to V
I
The STMPE1801 7-bit addressing is set to 40h.
Start condition
A Start condition is identified by a falling edge of SDA while SCL is stable at high state. A
Start condition must precede any data/command transfer. The device continuously monitors
for a Start condition and does not respond to any transaction unless one is encountered.
The first byte is scanned after the START command is detected to check for device ID.
Ensure that all state machines are flushed when START instruction is issued.
Stop condition
A Stop condition is identified by a rising edge of SDA while SCL is stable at high state. A
Stop condition terminates the communication between the slave device and bus master. A
read command that is followed by NoAck can be followed by a Stop condition to force the
slave device into idle mode. When the slave device is in idle mode, it is ready to receive the
next I
operation to the registers.
Once the Stop condition is detected, the device should release the bus and go to Hibernate
mode if there is no more activity.
An I
cause any I
2
2
2
C related pins
C addressing
C specification
2
I
Operates at V
Compliant to Philips I
Supports standard (up to 100 kbps) and fast (up to 400 kbps) modes
7-bit device addressing modes
General call
Start/Restart/Stop
SCL
SDA
C transaction with a START bit followed immediately by a STOP condition should not
2
2
C slave device
C transaction. A Stop condition at the end of a write command stops the write
2
C lock-up.
CC
(1.8 - 3.6 V)
2
C specification version 2.1
Doc ID 17884 Rev 3
2
C interface are listed below:
2
C and 3.3 V I
2
C operations. It is recommended that
CC
.
STMPE1801