VT5376(2007) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

VT5376
(Rev.:2007)

Ultra-low power laser motion sensor for optical mouse applications

STMicroelectronics 

Power supply options and power consumption

VT5376

2

Power supply options and power consumption

The sensor includes a DCDC controller to supply the laser or the LED. This allows the

overall sensor system to operate from a single AA or AAA battery supply voltage (from 1.6V

down to 1V), allowing for a simple and low power / low cost system design. Two power

supply schemes can be used.

2.1

Low cost application

The internal DCDC controller and voltage regulators are used so that the overall application

can be supplied from a single AA/AAA battery cell, without the need of an extra DCDC chip.

This approach is extremely economical.

Table 2.

Power supply and power consumption

Run

4,000fps

2,000fps

1,000fps

Conditions

speed>14ips 7ips < speed < 14ips 7ips >speed

IDLE1(1)

wake up

latency

10ms

IDLE2(2) SLEEP(3)

wake up

latency

100ms

wake up

latency

500ms

Total @Vtop

chip + LED/laser

5.3mA

3mA

1.9mA

0.22mA

0.1mA

0.08mA

Total chip @Vbat 0.04mA

0.04mA

0.04mA

0.04mA

0.04mA

0.04mA

1. No motion for 50 ms

2. No motion for 8 seconds

3. No motion for 10 minutes

Note: 1 DCDC efficiency from single battery cell to Vtop (typical 2.2V) is around 70%.

2 DCDC output maximum drive is 25mA total average, which should be sufficient for the

overall application.

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