AK4180 Datasheet, PDF (5/17 Pages) Asahi Kasei Microsystems – Touch Screen Controller

[ASAHI KASEI]
[AK4180]
Analog Characteristics
Ta=-20°C to 70°C,VCC=2.7V, Vref=2.5V, fs=125kHz, MCLK=16*fs
Parameter
min
typ
Max
Units
ADC for Touch Screen
Resolution
12
Bits
No Missing Code
10
12
Bits
Integral Linearity Error
±5
LSB
Analog Input Voltage Range
0
Vref
V
Offset Error
0
20
LSB
Gain Error
-12
0
LSB
Touch Panel Driver
X+, Y+, RL=300Ω
X-, Y-, RL=300Ω
5
Ω
5
Ω
PSRR
70
dB
Reference Output
Internal Reference Voltage@VCC=3.0V, 20°C
2.4
2.5
2.55
V
Load Capacitance
0.1
uF
Reference Input
Input Voltage Range
VCC
V
Input Impedance
98
196
kΩ
Battery Monitor
Input Voltage Range
5.0
V
Input Impedance (Battery Measure Mode)
10
kΩ
Accuracy *)
±3
%
Temperature Measurement
Temperature Range
-20
70
V
Resolution **)
1.6
°C
Accuracy ***)
±3
°C
Power Supply Current
Normal Mode (Internal VREF OFF)
250
500
µA
Normal Mode (Internal VREF ON)
520
800
µA
Full Power Down
0
10
µA
*) Accuracy is the difference between the output code when 5 volts is input to the VBAT pin and the “ideal” code at 1.25 volts.
**) “ideal” value derived from theory
**) Accuracy is defined as the difference between the voltage measured by two current sources, and the ideal voltage derived from
theory at specific temperatures.
<MS0195-E-01>
5
2003/02