STCF03I datasheet(14/33 Pages) STMICROELECTRONICS

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Introduction

STCF03I

14/33

7.2.4

ADD pin

With this pin it is possible to select one of the 4 possible I2C slave addresses. No internal

pull-up nor pull-down is provided. The pin has to be connected to either GND, VI, SCL or

SDA to select the desired I2C slave address (see Table 7)

It is necessary to keep SCL and SDA high during power on reset, otherwise the I2C device

address may be recognized improperly.

7.2.5

TMSK pin

This pin can be used to implement the TX masking function. This function has effect only for

Flash current settings higher than 200 mA (bit FDIM_3=1). Under this condition, when this

pin is pulled high by the µP, the current flowing in the LED is forced at 200 mA typ. No

internal pull-up nor pull-down is provided; to be externally wired to GND if TX masking

function is not used.

7.3

I2C BUS interface

Data transmission from the main µP to STCF03I and vice versa takes place through the 2

I2C bus interface wires, consisting of the two lines SDA and SCL (pull-up resistors to a

positive supply voltage must be externally connected). The recommended maximum voltage

of these signals should be 3.0 V.

Table 7. Address table

ADD pin

GND

011000

R/W

VBAT

011000

R/W

SDAL

011001

R/W

SCL

011001

R/W

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