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AN246

STMPE801 - Hardware Interface guide

STMicroelectronics 

AN2466

Figure 5. I2C pin structure

Pin description of STMPE801

INTERNAL

BLOCKS

INPUT BUFFER

Open

Drain

Buffer

PAD

ESD DIODE

Figure 6. I2C line with external pull-up resistors

2.2.1

I2C General call

STMPE801 supports I2C general call based on the following table. When a general call

address of 0x00 with R/ W = 0 is sent, the device responds with an acknowledgement and

performs the instruction given by the second byte. The device does not give ACK for any

second byte other than the valid second bytes listed in Table 3.

Table 3. I2C General call

Second byte

Definition

0x06

0x04

0x0

Slave device should reset and latch in the slave address

Slave device should latch in the slave address but without reset.

Not allowed as second byte.

2.3

Reset pin (RESET_N)

The Reset pin is an active low input. It should be tied HIGH to VIO supply in order to start

normal operation of the device. Apart from the RESET_N pin, the device can also be reset

through the "Soft_Reset" bit in the SYSCON register. Writing a '1' to Bit 7 resets the device

and after reset, the bit is cleared to '0' by the Hardware.

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