Datasheet

1160
42023E–SAM–07/2013
ATSAM4L8/L4/L2
42.9.7 Liquid Crystal Display Controler characteristics
42.9.7.1 Liquid Crystal Controler supply current
The values in Table 42-52 are measured values of power consumption under the following con-
ditions, except where noted:
• T=25°C, WAIT mode, Low power waveform, Frame Rate = 32Hz from OSC32K
• Configuration: 4COMx40SEG, 1/4 Duty, 1/3 Bias, No animation
• All segments on, Load = 160 x 22pF between each COM and each SEG.
• LCDCA current based on I
LCD
= I
WAIT
(Lcd On) - I
WAIT
(Lcd Off)
Table 42-51. Liquid Crystal Display Controler characteristics
Symbol Parameter Conditions Min Typ Max Units
SEG Segment Terminal Pins 40
COM Common Terminal Pins 4
f
Frame
LCD Frame Frequency F
CLKLCD
31.25 512 Hz
C
Flying
Flying Capacitor 100 nF
V
LCD
LCD Regulated Voltages
(1)
CFG.FCST=0
1. These values are based on simulation. These values are not covered by test limits in production or characterization
C
Flying
= 100nF
100nF on V
LCD
, BIAS2 and BIAS1 pins
3
VBIAS2 2*V
LCD
/3
BIAS1 V
LCD
/3
Table 42-52. Liquid Crystal Display Controler supply current
Symbol Conditions Min Typ Max Units
I
LCD
Internal voltage generation
CFG.FCST=0
V
VDDIN
= 3.6V
8.85
µA
V
VDDIN
= 1.8V
6.16
External bias
V
LCD
=3.0V
V
VDDIN
= 3.3V
0.98
V
VDDIN
= 1.8V
1.17