CXA3621GE
Fingerprint Sensor
Description
The CXA3621GE is an electrostatic capacitance
method fingerprint sensor.
This monolithic IC integrates the sensor block,
sense amplifier (3-bit gain adjustment), sample-andhold, output amplifier and output buffer needed to
acquire fingerprint images, as well as the timing
generator for determining the operation of these
functions onto a single chip.
Features
• Electrostatic capacitance type sensor (charge transfer method)
• Number of pixels: 192 × 128
• 317 DPI
• Low power consumption (50mW or less) ∗ When P/S: 18µW or less
• Single 3.0V power supply
• Sensor gain control: 3 bits
• S/N ratio improved by on-chip sensor block parasitic capacitance cancel function
30 pin LLGA (Plastic)
Applications
Fingerprint verification units
Structure
Silicon gate CMOS IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage AVDD, DVDD VSS – 0.5 to +7.0 V
• Input voltage VI VSS – 0.5 to VDD + 0.5 V
• Output voltage VO VSS – 0.5 to VDD + 0.5 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –25 to +125 °C
• Allowable power dissipation PD 1100 mW
Recommended Operating Conditions
• Supply voltage AVDD, DVDD 2.7 to 3.6 V
• Ambient operating temperature Ta 0 to +50 °C
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
– 1 –
E02127-PS
Pin Description
CXA3621GE
Serial
No.
—
1
2
3
4
5
6
7
8
9
10
11
12
Land No.
2B
2C
2D
2E
2F
3B
3C
3D
3E
3F
4B
4C
4D
Symbol
SUB
SGND
AVDD
AVSS
VM
VCS_S
TEST1
TEST2
TEST3
DI0
DI1
DI2
XSP
I/O
Power
Power
Power
Power
A/O
A/O
D/I
D/I
D/I
D/I
D/I
D/I
D/I
Description
Substrate electrode (chip rear surface electrode) 3.0V (VDD).
Sensor lightning conductor electrode. (Connect to the GND which
is the other system of operating power supply.)
Analog power supply 3.0V.
Analog GND.
Sense amplifier reference voltage monitor 1.5V (1/2 VDD).
(Do not connect.)
Sense amplifier current source bias monitor. (Do not connect.)
Test mode selection. (Connect to GND.)
Test mode selection. (Connect to GND.)
Test mode selection. (Connect to GND.)
Gain setting input (LSB).
Gain setting input.
Gain setting input (MSB).
Sense start pulse (negative pulse).
The column and row shift registers and the timing generator are
cleared by this signal.
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
4E
4F
5F
5E
5D
5C
5B
6F
6E
6D
6C
6B
7F
7E
7D
7C
CLK
PS
SVDS
ADCLK
C_CK
RSRO
CSRO
DVSS
DVDD
NC
VCS_O
VOS
AOUT
AVSS
AVDD
SGND
D/I
D/I
D/O
D/O
D/O
D/O
D/O
Power
Power
—
A/O
A/O
A/O
Power
Power
Power
Main clock 2MHz.
Power saving mode setting. (Low: Operation; High: Standby)
Integrating pulse monitor. (Do not connect.)
Delay clock. (Do not connect.)
Column shift register clock. (Do not connect.)
Column shift register final output. (Do not connect.)
Row shift register final output. (Do not connect.)
Digital GND.
Digital power supply 3.0V.
No connection. (Do not connect.)
Output amplifier current source bias monitor. (Do not connect.)
Output amplifier reference voltage monitor 1.09V (4/11VDD).
(Do not connect.)
Sensor output.
Analog GND.
Analog power supply 3.0V.
Sensor lightning conductor electrode. (Connect to the GND which
is the other system of operating power supply.)
– 4 –
CXA3621GE
Electrical Characteristics
DC Characteristics (Vss = 0V, Ta = 25°C)
Item
Analog supply voltage
Digital supply voltage
Current consumption
(for operation)
Current consumption
(for standby)
Input voltage (High)
Input voltage (Low)
Output voltage (High)
Output voltage (Low)
Input leak current
Output voltage
Output voltage
Symbol
AVDD
DVDD
IDD1
IDD2
VIH
VIL
VOH
VOL
IL
VM
VOS
VDD = 3V, P/S = L
VDD = 3V, P/S = H, CLK = L
Digital (CMOS) input cell
Digital (CMOS) input cell
VDD = 3V, IOH = –800µA
VDD = 3V, IOL = 2.4mA
VDD = 3V,
digital (CMOS) input cell [3V/0V]
VDD = 3V
VDD = 3V
Conditions
Min.
2.7
2.7
5.0
0.7VDD
Vss
2.6
0
–1
1.4
1.00
Typ.
3.0
3.0
8.5
1.5
1.09
Max.
3.6
3.6
13.0
5
VDD
0.3VDD
3.0
0.4
1
1.6
1.20
Unit
V
V
mA
µA
V
V
V
V
µA
V
V
AC Characteristics (VDD = 3.0V, VSS = 0V, Ta = 25°C)
Item
Clock input period
Symbol
CLK
Conditions
Min.
400
Typ. Max.
Unit
ns
Number of sensor defects
1
Output voltage (Air_Level)
Output voltage (Water_Level)
∗1
Output voltage Air Level means the output level in the condition where nothing is placed against the sensor
AOUT
AOUT
∗
2
∗
0
850
950
1090
1200
3
1350
1450
surface (in other words, in air). This rating value is obtained by measuring 32 points within one line of the
sensor output and then taking the average.
The gain setting for this measurement is (011).
∗2
Output voltage Water Level specifies the degree to which the output level changes from the Air Level when
a drop of water is placed on the sensor surface. However, it is unrealistic to place a drop of water on each
sensor surface when sorting products, so 32 virtual capacitors (parasitic capacitance equal to the level
when a drop of water is placed on the surface) are built into the sensor chip, and the average of these
output values is calculated. The difference from the Air Level noted above becomes the Water Level.
The gain setting for this measurement is (011).
Defects
mV
mV
– 5 –