STMPE1600 datasheet(12/27 Pages) STMICROELECTRONICS

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I2C features

STMPE1600

12/27

Doc ID 16938 Rev 3

Note: All other second byte values will be ignored.

3.1

Turning I2C block OFF and ON

The STMPE1600 operates entirely on the I2C clock. When there is no activity on the I2C

bus, current consumption of the device is extremely low. However, when there is activity on

the I2C bus, current consumption increases, even if the I2C traffic is not directed to the

assigned address.

The host system may choose to shut-down the I2C block in the STMPE1600, if no access to

the registers is required. This feature allows the current consumption to drop to the

minimum. Host system turns OFF the I2C block by writing '1' into the I2C_SHDN bit. The I2C

block will shut down on the next valid clock edge of the I2C clock signal. In this state, the

device cannot be accessed by I2C, as the I2C has shut down completely.

To turn ON the I2C block, system host must reset the STMPE1600 in order to re-activate the

I2C block either by removing VCC and bringing it back again. Or by using GPIO_0 for wake-

up function.

Table 6.

General call

R/W

Second Byte Value

Definition

0x06

2-byte transaction in which the second byte tells the slave device

to reset and write (or latch in) the 1-bit programmable part of the

slave address.

0x04

2-byte transaction in which the second byte tells the slave device

not to reset and write (or latch in) the 1-bit programmable part of

the slave address.

0x00

Not allowed as second byte.

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