AT77C105A Datasheet, PDF (3/39 Pages) ATMEL Corporation – FingerChip Thermal Fingerprint Sweep Sensor, Hardware Based Navigation and Click Functions, Extended I/O range(1.8-3.3V)

5419A–BIOM–01/05
AT77C105A [Preliminary]
Figure 1. Typical Application
VDDD VDDD
10 kΩ
10 kΩ
IRQ
MISO
MOSI
SCK
SSS
FSS
SCANEN
GND
RST
VDD_IO
TESTA
VDD_IO
VDDD
GNDD
VDDA
GNDA
FPL
NC _VDDD
10 µF
VDDA
10µF
GND
The pull-up must be implemented for the master controller. The noise should be lower
than 30 mV peak to peak on VDDA.
Figure 2. Pin Description
NC
1
NC
2
NC
3
NC
4
GNDD
5
GNDA
6
VDDD
7
VDDA
8
SCK
9
TESTA
10
MOSI
11
VDD_IO
12
MISO
13
SCANEN
14
SSS
15
IRQ
16
FSS
17
RST
18
FPL
19
The TESTA pin is only used for testing and debugging. The SCANEN pin is not used in
the final application and must be connected to ground.
Warning: SSS and FSS must never be low at the same time. When both SSS and FSS
equal 0, the chip switches to scan test mode. With the SPI protocol, this
configuration is not possible as only one slave at a time can be selected.
However, this configuration works when debugging the system.
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