STCF03I_08 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)

When ADD is connected to GND the I²C address is assigned automatically while in the

other three configurations in which ADD pin is connected to VBAT or SDA or SCL, the

following procedure must be activated in order that the right address is assigned.

After applying VBAT to the chip, the VBAT voltage must be pulled down to GND for a time

longer than 100 ms. After that time the right I²C address is assigned to the chip. This

procedure must be repeated every time the VBAT voltage is disconnected (see Figure 4

below).

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.

Table 7.

Address table

ADD pin

GND

011000

R/W

VBAT

011000

R/W

SDAL

011001

R/W

SCL

011001

R/W

Figure 4.

Procedure for assigning a non-default I²C address

SDA LINE

DEVICE

ADDRESS

7 bits

ADDRESS OF

DATA

….

SCL LINE

VBAT

100ms

Address is assigned.

The new I²C address

can be used for SCL

and SDA

SDA LINE

DEVICE

ADDRESS

7 bits

ADDRESS OF

DATA

….

SCL LINE

VBAT

100ms

Address is assigned.

The new I²C address

can be used for SCL

and SDA

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