STW5095 datasheet(14/73 Pages) STMICROELECTRONICS

14 / 73 page

STw5095

Functional description

13/72

Device Programming: I2C. The I2C Control Interface timing is shown in

Section 6.1 on

page 43. The interface has an internal counter that keeps the current address of the control

loaded with the data of the

increased after each data byte read or write. It is possible to access the interface in 2

modes: single-byte mode in which the address and data of a single register are specified,

and multi-byte mode in which the address of the first register to be written or read is

specified and all the following bytes exchanged are the data of successive registers starting

from the one specified (in multi-byte mode the internal address counter restart from register

0 after the last register 36). Using the multi-byte mode it is possible to write or read all the

registers with a single access to the device on the I2C bus.

Device Programming: SPI. The SPI Control Interface timing is shown in

Section 6.2 on

page 44. Bits SPIOSEL (SPI Output Select) in CR33 control the out pin selection for serial

data out (none, AD_OCK, DA_OCK or IRQ), while bit SPIOHIZ=1 in CR33 selects the high

impedance state of serial data out pin when idle. The first bit sent on SDIN, after CSB falling

edge, sets the interface for writing (SDIN=1) or reading (SDIN=0), then a 7-bit Control

If the interface is set for writing then the last 8 bits on SDIN are written in the control register.

If the interface is set for reading then after the 7 bit address STw5095 sends out 8 bits data

on the pin selected with bits SPIOSEL in CR33, while bits present at SDIN pin are ignored.

If SPIOSEL=00 (no out pin selected) the reading access on SPI interface can still be useful

to clear the IRQ event bits in CR32.

4.3

Power up

STw5095 internal blocks can individually be switched on and off according to the user

needs. A general Power Up bit is present at bit 7 of CR0. The output drivers should always

be powered up after the general power up. See the following drawing to select the needed

block for the desired function. A fast-settling function is activated to quickly charge external

capacitors when the device is switched on (CAPLS, CAPLINEIN and CAPMIC).

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