AT77C104B datasheet(29/36 Pages) ATMEL

Part #	AT77C104B

Description	FingerChip Thermal Fingerprint Sweep Sensor, Hardware Based, Navigation and Click Function, SPI Interface

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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29 / 36 page

AT77C104B

5347B–BIOM–08/04

The dissipated die power is quasi constant over a significant supply voltage range as

shown below (mode 50 mW selected):

Figure 18.

Note:

This function is useless for navigation and click modes.

Power Management

Sleep Mode (<10 µA)

Reset high

Standby Mode

(<10 µA Providing SPI

Bus not Accessed)

Power consumption can be reduced in several ways:

•

By switching off the FingerChip sensor.

•

By programming a standby mode by writing 00001xx in the MODCTRL register

(STANDBY mode set and oscillator stopped.) Bit b6 (HEAT) of the HEATCTRL

Acquisition Mode

Current Consumption

Static Current Consumption

When the SPI bus is not used, only the analog part of the circuit consumes power at

around 4 mA.

Dynamic Current

Consumption

When the clock is running, the digital sections also consume current. With a 30 pF load

at 16 MHz, the power consumption is approximately 4.5 mA on the V

DD pins.

Power = f ( Vdd )

4,80E-02

4,90E-02

5,00E-02

5,10E-02

5,20E-02

5,30E-02

5,40E-02

2,2

2,4

2,6

2,8

3,2

3,4

3,6

3,8

VDD

Power = f ( Vdd)

AT77C104B Datasheet(PDF) 29 Page - ATMEL Corporation

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