Datasheet

77
XMEGA B3 [DATASHEET]
8074D–AVR–08/2013
36.6 Liquid Crystal Display Characteristics
Table 36-8. Liquid crystal display characteristics.
Notes: 1. Applies to Static and 1/3 bias
36.7 ADC characteristics
Table 36-9. Power supply, reference and input range.
Table 36-10. Clock and timing.
Symbol Parameter Condition Min Typ Max Units
SEG Segment terminal pins 0 40
COM Common terminal pins 0 4
f
Frame
LCD frame frequency F(clk
LCD
)=32.768kHz 31.25 512 Hz
C
Flying
Flying capacitor 100 nF
Contrast Contrast adjustment -0.5 0 0.5
V
V
LCD
LCD regulated voltages
C
Flying
= 0.1µF
0.1µF on V
LCD
, BIAS2 and
BIAS1 pins
3
BIAS2 2*V
LCD
/3
BIAS1 V
LCD
/3
R
COM
Common output impedance COM0 to COM3
(1)
0.25 0.5 1
k
R
SEG
Segment output impedance SEG0 to SEG39
(1)
2 4 8
Symbol Parameter Condition Min. Typ. Max. Units
AVCC Analog supply voltage V
CC
- 0.3 V
CC
+ 0.3 V
VREF Reference voltage 1 AV
CC
- 0.6 V
R
in
Input resistance Switched 4.5 k
C
in
Input capacitance Switched 5 pF
R
AREF
Reference input resistance (leakage only) >10 M
C
AREF
Reference input capacitance Static load 7 pF
Vin Input range 0 V
REF
V
Vin Conversion range Differential mode, Vinp - Vinn -0.95*V
REF
0.95*V
REF
V
Vin Conversion range Single ended unsigned mode, Vinp -0.05*V
REF
0.95*V
REF
V
Symbol Parameter Condition Min. Typ. Max. Units
Clk
ADC
ADC Clock frequency
Maximum is 1/4 of Peripheral clock
frequency
100 1800
kHz
Measuring internal signals 125
f
ClkADC
Sample rate 16 300 ksps