ZFM-70 SeriesFingerprint Identification Module
User Manual
www.zhiantec.com
Hangzhou Zhian Technologies Co.,Ltd
12
Considering that the power consumption of the whole module, a fingerprint module only work and not work
two kinds of state, no hibernation or standby; normally closed power input of fingerprint module, the fingerprint
module does not work; when the MCU (MCU) needs to access a fingerprint module function, provide a
fingerprint module power supply input, fingerprint module work, complete the corresponding command, if you no
longer use fingerprint module, the fingerprint module power supply is cut off, the fingerprint module into the not
working state.
With ZFM-708 module touch induction (ZFM-706 does not have this feature), the default configuration
output high level effectively. The finger when no put in the acquisition window, a touch signal output is low; when
the finger on the acquisition window, a touch signal output change is high. The signal can be connected with the
single chip computer (MCU) certain interrupt feet or IO port, after receive the induction signal, awaken the MCU
(MCU), power supply to the fingerprint module, the fingerprint module begins to work.
the default power supply voltage of touch induction is 3.3V-5V, can also be directly connected with the 4
battery, the touch induction circuit the overall power consumption current of <10uA; the circuit can continuously
supply.
The touch sensing signal output, can be customized to output low level effectively, if you need this function,
please inform our company
3.1.2 Serial communication protocol
The mode is semiduplex asychronism serial communication. And the default baud rate is 57600bps. User
may set the baud rate in 9600
~
115200bps
。
Transferring frame format is 10 bit: the low-level starting bit, 8-bit data with the LSB first, and an ending bit.
There is no check bit.
3.1.3 Reset time
At power on, it takes about 300ms for initialization. During this period, the Module can’t accept commands
for upper computer.After reset complete, the module will send a byte(0x55) .
3.1.4
Electrical paramenter (All electrical level takes GND as reference)
1.
Power supply
Item
Parameter
Unit
Note
Min
Typ
Max
Power Voltage (Vin)
3.8
7.0
V
Normal working value.
Maximum Voltage
(Vinmax)
-
0.3
9.0
V
Exceeding the Maximum rating may
cause permant harm to the Module.
Operation Current (Icc)
55
60
95
mA
Peak Current (Ipeak)
95
mA
2.
TD
(
output, TTL logic level
)
D0
0
1
D7
D6
D5
D4
D3
D2
D1
1
起始位
停止位
10位帧格式