STCF03PNR datasheet(14/35 Pages) STMICROELECTRONICS

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Introduction

STCF03

14/35

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 either GND, VI, SCL or SDA

to select the desired I2C slave address (see Table 6.)

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 P, 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 STCF03 and vice versa takes place through the 2 wires

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.

7.4

Data validity

As shown in Figure 4, the data on the SDA line must be stable during the high period of the

clock. The HIGH and LOW state of the data line can only change when the clock signal on

the SCL line is LOW.

Table 7. Address table

ADD pin

GND

011000

R/W

VBAT

011000

R/W

SDAL

011001

R/W

SCL

011001

R/W

Figure 4.

Data validity on the I2C Bus

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