VD5377 datasheet(24/88 Pages) STMICROELECTRONICS

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I/O description

VD5377

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Doc ID 022952 Rev 2

I/O description

5.1

I2C_SEL[2:0]

The default I2C address is 0xA6. However, in some applications the default address may

conflict with other I2C devices sharing the bus or it may be necessary to chain multiple OFN

devices on the same bus. For that reason, the user can select from one of seven I2C

addresses as shown in Table 12.

The I2C_SEL pads have internal pull-down resistors and can be left unconnected for the

default address. For any other address, connect pads that require a logic “1” to DVDD (the

internal pull-down resistor is automatically disconnected after the internal microcontroller

boot sequence is completed to conserve power).

If required, custom configurations can be stored in ROM on the device corresponding to a

particular I2C address to reduce the number of required register writes by the host. If

interested in this feature, please contact STMicroelectronics.

The device I2C address can also be configured dynamically by writing to register DEVADDR

(0x7c) bits [7:1] (see Table 13). This sets the 7-bit base I2C address of the device and

allows multiple devices with the same default address to be re-mapped dynamically. This

operation must be done in 2 steps:

•

program register 0x7c using the current device address to program the new one

•

access registers with the new device address

Each device must be powered in turn to reconfigure its address and this operation must be

repeated each time the system is initialized.

Table 12. User-selectable I2C addresses

I2CSEL[2:0]

8-bit I2C address

000

0xA6

001

Reserved

010

0xC6

011

0xD6

100

0xE6

101

0x36

110

0x46

111

0x20

Table 13. Control register to dynamically configure device I2C address

Addr

(Hex)

SIgnal name

Bit

Type

Default

(Hex)

Comment

DEVADDR

i2cs_index_auto_inc_en

PRW

Auto increment function

i2cs_dev_addr

7:1 PRW

I2C device address

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