VD5377 datasheet(19/88 Pages) STMICROELECTRONICS

19 / 88 page

Doc ID 022952 Rev 2

19/88

VD5377

System overview

Table 8 summarizes the typical operating current in Manual mode.

Figure 8 describes the power-up sequence of the VD5377.

Figure 8. Manual power mode timing diagram

After the MCU boot sequence is completed, the system enters SW STDBY state and the

MOTION pin is set to 1 indicating that the device is ready to receive commands from the

host. After initialization by the host over I2C, the device enters the MANUAL RUN state and

the MOTION pin goes low.

Note:

The MOTION pin polarity is programmable. If active low polarity is selected during

initialization, the MOTION pin will remain high.

If the STANDBY pin is asserted, the system completes the current frame operation before

entering the STANDBY state and stopping the internal system clock. When the STANDBY

pin is deasserted, the system clock is restarted and the device resumes in the RUN state

(no re-initialization required). If the POWERDOWN pin is asserted (active high), the internal

1.8 V regulator is disabled and the 1.8 V core supply is switched off. When the

Table 8. Typical power consumption(1) - Manual mode

1. Includes LED (maximum exposure)

Run(2)

2. Internal clock = 44 MHz; led_dac 14 mA; Maximum exposure

Standby

Power down

3k3 kf/s

2 kf/s

1 kf/s

10.2 mA

6.9 mA

4.5 mA

25 µA

<1 µA

VTop

DVDD/AVDD

POR

System

Clock

POWERDOWN (I)

System States Power Up

SW STDBY

MANUAL

STANDBY

POWERDOWN

Power Up

STANDBY (I)

MOTION (O)

I2C (I/O)

MCU BOOT

RUNNING

state

MANUAL

RUNNING

host_config_done

Power Up

MCU BOOT

STANDBY pin latency

up to 1 frame duration

Device Ready

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