STV-376-E02 データシートの表示（PDF） - STMicroelectronics

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STV-376-E02

Ultra-low power motion sensor for optical finger navigation and laser mice

STMicroelectronics 

Motion performance

1

Motion performance

VT5376

Note:

The sensor can operate with a VCSEL or LED (visible and IR), and when bundled with the

appropriate optics subsystem is able to track motion on a wide range of surfaces up to

speeds of 1 m/s (40 ips), and to detect acceleration of up to 20 g. The sensor achieves this

top speed with very low drift and high accuracy.

Although this device features an UltraLowPower motion detection machine, the power

saving has not been achieved by compromising tracking accuracy.

1.1

Technical specifications

Table 1. Technical specifications

Parameter

Description

Resolution

Pixel size

Array size

Frame rate

Tracking performances

Supply voltage

Operating temperature

Package type

Programmable up to 3200 CPI

30.4 µm

20 x 20 pixels

up to 4000 fps

Laser or LED: 1m/s

Very low drift.

1 to 1.6V(1), 1.8V direct drive or 2.2 to 3.3V

0°C to 60°C

7 mm x 7 mm x 1.4 mm 32 lead LOQFP

(Low profile Optical Quad Flat Pack)

1. Using internal boost converter controller.

1.2

1.2.1

Battery life management

The battery life management (in no motion state) can be done manually where the external

MCU is the master and controls the sensor state with its POWERDOWN pin (default mode).

Alternatively, the sensor can manage its own power states. In no motion, it cycles through

IDLE and SLEEP modes automatically without any intervention from the MCU.

Therefore, by using the sensor’s automatic power management, the MCU can be fully

switched OFF in the case of no motion allowing for extra power savings, and resulting in a

very simple driver firmware design.

Manual power management using POWERDOWN pin

In this mode, the chip is woken-up by pulling the POWERDOWN pin low. When doing so

both the analog and DCDC engines are woken up in a programmed sequence. The

POWERDOWN pin can then be pulled high straight away as the sensor undergoes just a

single frame sequence.

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Doc ID 13939 Rev 4

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