vt5376 STMicroelectronics, vt5376 Datasheet - Page 6

• Manufacturer Part Number: vt5376
• Description: Ultra-low Power Laser Motion Sensor For Laser Mouse Applications
• Manufacturer: STMicroelectronics

Power supply options and power consumption
2
2.1
Table 2.
1. No motion for 50 ms
2. No motion for 8 seconds
3. No motion for 10 minutes
Note:
6/24
Conditions
Total @Vtop
chip + LED/laser
Total chip @Vbat
1
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.
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.
Power supply and power consumption
DCDC efficiency from single battery cell to Vtop (typical 2.2V) is around 70%.
DCDC output maximum drive is 25mA total average, which should be sufficient for the
overall application.
speed>14ips 7ips < speed < 14ips
4,000fps
0.04mA
5.3mA
2,000fps
0.04mA
3mA
Run
7ips >speed
1,000fps
0.04mA
1.9mA
IDLE1
wake up
0.22mA
0.04mA
latency
10ms
(1)
IDLE2
wake up
0.04mA
latency
100ms
0.1mA
(2)
SLEEP
wake up
0.08mA
0.04mA
latency
500ms
VT5376
(3)