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AN246

STMPE801 - Hardware Interface guide

STMicroelectronics 

AN2466

Pin description of STMPE801

Table 1.

Pin

15

16

STMPE801 Pin description (continued)

Name

Type

GPIO_6

IO

GPIO

GPIO_7

IO

GPIO

Description

2.1

Power Supply - VCC and VIO

The STMPE801 device operates on two different power supplies, VCC and VIO. Both VCC

and VIO can function in the range of 1.65 V to 3.6 V. This enables a variety of devices to

interface directly to the device without a level translator block.

Proper decoupling capacitors should be used to filter out the Power supply noise. There are

some critical points to be noted to ensure proper functioning of the device as listed below:

– VCC pin supplies the I2C lines and ADDRESS pin.

– All other pins are connected to the VIO supply.

– At any time, to conserve power, the VCC can be turned off if there is no I2C activity

but at no point, should the VIO be turned off while the VCC is ON.

– The VIO should always be ≥VCC

2.2

I2C Interface

The port expander STMPE801 can be controlled with just the two I2C lines. All internal

registers can be accessed through this I2C interface. The I2C interface features are as given

below:

– I2C Slave device

– Operates on the VCC supply (1.65 V to 3.6 V)

– Compliant to Philip I2C specification version 2.1

– Supports standard (up to 100kbps) and fast (up to 400kbps) modes.

– 7-bit addressing mode supported.

– General call

– Up to two STMPE801 devices can be connected on the same I2C bus

The slave address is selected by the state of the ADDRESS pin. The address is read every

time the I2C transaction occurs. This implies the slave address of the device can be

changed on the fly without any need for latching the address into the device at reset.

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