VD5377 datasheet(29/88 Pages) STMICROELECTRONICS

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Doc ID 022952 Rev 2

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VD5377

I/O description

5.4

STANDBY

The STANDBY pad is a 1.8 V digital input (active high/ 5 V tolerant). In MANUAL RUN

mode, if STANDBY is asserted the device enters a low power STANDBY state at the end of

the current frame (see Figure 7: Manual power mode flow diagram on page 18). When

STANDBY is de-asserted the device resumes in RUN mode without requiring re-

initialization.

In AUTOMATIC RUN mode, the STANDBY pin acts as a I2C enable (see Figure 15). When

STANDBY = 0, I2C is enabled and the VD5377 will respond to I2C communication from the

host in either RUN or any of the SLEEP states. When STANDBY = 1 the VD5377 consumes

less power but will not respond to I2C communication. In order to use the STANDBY pin in

AUTOMATIC mode the use_standby_pin (register 0x5 SYSTEM_CONFIG bit 4 in Table 17:

Features and scaling on page 32) must be set during system initialization. If this function is

not required, the use_standby_pin register should be set to 0 and the STANDBY pad should

be connected to either VDD or VSS.

Note:

If use_standby_pin = 1, the STANDBY pin must be set to 0 before each I2C transaction even

if motion data is pending.

GPIO_MOTION

gpio_motion_en

PRW

MOTION output enable (active

low)

0 = PAD configured as

OUTPUT

1 = PAD configured as INPUT

gpio_motion_a

PRW

MOTION data output

(when _en = 0)

gpio_motion_zi

MOTION IO value

gpio_motion_pd

PRW

MOTION pull-down control

(internal 35 kOhms pull-down

resistor) - active LOW

0 = IO is pulled down

1 = IO not pulled down

gpio_motion_a_ctrl

PRW

MOTION data output origin

0 = Output value from HW

1 = Output value from motion

detect IP

Reserved

6:5 PRW

Reserved

gpio_motion_opendrain

PRW

MOTION pad open drain control

0 = MOTION pad normal config

1 = MOTION pad in open drain

(A = EN)

Table 16. Control register for motion pin polarity (continued)

Addr

(Hex)

SIgnal name

Bit

Type

Default

(Hex)

Comment

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