Motion performance

VT5376

4/30

1

Motion performance

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 1m/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.

Note:

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

saving has not been achieved by compromising tracking accuracy.

1.1

Technical specifications

1.

Using internal boost converter controller. Otherwise, voltage supply ranges from 1.7V to 1.9V.

1.2

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 via 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.

1.2.1

Manual power management via POWERDOWN pin

In this mode the chip is woken-up by de-asserting the POWERDOWN pin. When doing so

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

POWERDOWN pin can be re-asserted straight away as the sensor undergoes just a single

frame sequence.

Table 1.

Technical specifications

Parameter

Description

Resolution

Programmable up to 3200 CPI

Pixel size

30.4µm

Array size

20*20 pixels

Frame rate

up to 4000 fps

Tracking performances

Laser or LED: 1m/s

Very low drift.

Supply voltage

Operating temperature

0°C to 60°C

Package type

7 mm x 7 mm x 1.4 mm 32 lead LOQFP

(Low profile Optical Quad Flat Pack)