VD5377 datasheet(47/88 Pages) STMICROELECTRONICS

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Doc ID 022952 Rev 2

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VD5377

Basic start-up information

8.1

To ensure correct operation over the device operating temperature range (see Table 34:

Operating conditions on page 61) it is recommended to make the single register override

specified in Table 27 as part of the user initialization of the device in sw_standby.

8.2

Recommended start-up settings

The VD5377 needs to be initialized after power-up. The only required register write is

host_config_done = 1 (SYSTEM_CONFIG 0x5 bit 3). The rest of the start up settings vary

depending on application type.

The registers in Table 28 are the most commonly used on power on. (See Table 38: I2C

Table 27. Analog_ctrl2 recommended setting

Addr

(Hex)

Default

setting (Hex)

Recommended

setting

Description

ANALOG_CTRL2

0xf4

0xfc

Bits [3:2] DMIB DAC Vref setting =

1.6V

Table 28. Start-up settings

Description

0x3

Set LED DAC current (max is default) and register override

0xc

Set motion pin pin to open drain or push/pull (default)

0x27

Set X/Y direction

0x29

Set min features (default = 256 [16 x 16d])

0x2a / 0x2b

Set X/Y scaling

0x51

Set sun mode on (off is default)

0x5(1)

1. Customers are advised to set up the sensor (that is, CPI, XY direction and so on) before setting

host_config_done.

Set Auto/Manual power mode, motion pin polarity, use_standby_pin and

host_config_done

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