STV-376-E01(2008) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STV-376-E01
(Rev.:2008)

Ultra-low power laser motion sensor for laser mouse applications

STMicroelectronics 

VT5376

Power supply options and power consumption

2

Power supply options and power consumption

The sensor includes a DCDC controller to supply the laser / 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 for an external step-up

convertor device. This approach is extremely economical.

Table 2.

Typical power supply and power consumption

Run

4000 fps

2000 fps

1000 fps

IDLE1

Total @ ITop

(chip + Laser/LED)

5.8 mA

3.5 mA

2.4 mA

0.3 mA

Total chip @Vbat

0.04 mA

0.04 mA

0.04 mA

0.04 mA

IDLE2

0.15 mA

0.04 mA

SLEEP

0.1 mA

0.04 mA

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

2 Maximum load on Vtop is 25mA

2.2

External supply application

In this instance, the internal DCDC controller and voltage regulators are turned off and

bypassed. The sensor then needs to be supplied with a single regulated 1.8V +/- 0.1V.

Table 3.

Power supply and typical power consumption

Run

4000 fps

2000 fps

1000 fps

Total

@Vtop/Vbat/Dvdd/

Avdd (1.8V)

Chip + Laser/LED

5.8 mA

3.5 mA

2.4 mA

IDLE1

0.3 mA

IDLE2

0.15 mA

SLEEP

0.1 mA

7/30

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