ATXMEGA128B1 Datasheet, PDF (74/138 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA B1 Microcontroller

36.6 Liquid Crystal Display Characteristics
Table 36-8. Liquid crystal display characteristics.
Symbol Parameter
SEG Segment terminal pins
COM Common terminal pins
f_Frame
C_Flying
Contrast
LCD frame frequency
Flying capacitor
Contrast adjustment
V_LCD
BIAS2
LCD regulated voltages
BIAS1
R_COM
R_SEG
Common output impedance
Segment output impedance
Condition
F(clk_LCD)=32.768kHz
C_Flying = 0.1µF
0.1µF on V_LCD, BIAS2 and
BIAS1 pins
COM0 to COM3⁽¹⁾
SEG0 to SEG39⁽¹⁾
Notes: 1. Applies to Static and 1/3 bias
36.7 ADC characteristics
Table 36-9. Power supply, reference and input range.
Symbol
AVCC
VREF
R_in
C_in
R_AREF
C_AREF
Vin
Vin
Vin
Parameter
Condition
Analog supply voltage
Reference voltage
Input resistance
Switched
Input capacitance
Switched
Reference input resistance (leakage only)
Reference input capacitance Static load
Input range
Conversion range
Differential mode, Vinp - Vinn
Conversion range
Single ended unsigned mode, Vinp
Table 36-10. Clock and timing.
Symbol Parameter
Clk_ADC ADC Clock frequency
f_ClkADC
Sample rate
Condition
Maximum is 1/4 of Peripheral clock
frequency
Measuring internal signals
Min
0
0
31.25
-0.5
0.25
2
Typ
100
0
3
2*V_LCD/3
V_LCD/3
0.5
4
Max
Units
40
4
512
Hz
nF
0.5
V
1
k
8
Min.
V_CC- 0.3
1
0
-0.95*V_REF
-0.05*V_REF
Typ.
>10
7
Max.
V_CC+ 0.3
AV_CC- 0.6
4.5
5
V_REF
0.95*V_REF
0.95*V_REF
Units
V
k
pF
M
pF
V
Min.
Typ.
Max. Units
100
1800
kHz
125
16
300
ksps
XMEGA B1 [DATASHEET] 74
8330C–AVR–07/2012