VD5377CBSW datasheet(17/88 Pages) STMICROELECTRONICS

Part #	VD5377CBSW

Description	Ultra-low power motion sensor for optical finger navigation (OFN)

PDF	88 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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17 / 88 page

Doc ID 022952 Rev 2

17/88

VD5377

System overview

The VD5377 operates in one of two power management modes: MANUAL or AUTOMATIC

(see Figure 6). After initial MCU BOOT the device enters the SW STBY state and waits for

configuration from the host. When configured, the device enters MANUAL RUN or

AUTOMATIC RUN mode.

•

MANUAL power management mode is the simplest mode where the host initializes the

device which then remains in MANUAL RUN mode until it receives a command to

change mode (either an I2C command to return to the SW STBY state or a low power

state using the POWERDOWN or STANDBY pin).

•

AUTOMATIC power management mode is an intelligent, power efficient mode where

the device automatically switches to low power mode depending on motion activity.

When initialized, the device will continue to operate autonomously minimizing power

consumption and host CPU overhead.

Figure 6. VD5377 power management modes

MCU BOOT

SW STBY

MANUAL

host_config_done = 1

automatic = 0

host_config_done = 1

automatic = 1

host_config_done=0

AUTOMATIC

POWER UP

RUN

VD5377CBSW Datasheet(PDF) 17 Page - STMicroelectronics