AN2466

Pin description of STMPE801

5/13

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:

–

–

All other pins are connected to the VIO supply.

–

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

–

The VIO should always be

≥VCC

2.2

below:

–

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

–

–

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

–

7-bit addressing mode supported.

–

General call

–

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

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

15

GPIO_6

IO

GPIO

16

GPIO_7

IO

GPIO

Table 1.

STMPE801 Pin description (continued)

Pin

Name

Type

Description