Datasheet

DS_6612_001 78M6612 Data Sheet
Rev 2 33
4.4.10 VREF, VBIAS
Unless otherwise specified, VREF_DIS=0.
Table 17: VREF, VBIAS Performance Specifications
Parameter Condition Min Typ Max Unit
VREF output voltage, VNOM(25) Ta = 22ºC 1.193 1.195 1.197 V
VREF chop step 50 mV
VREF output impedance
VREF_CAL =1,
I
LOAD = 10 µA, -10 µA
2.5 kΩ
VNOM definition
1
2)22(1)22()22()(
2
TCTTCTVREFTVNOM −+−+=
V
VREF temperature coefficients
TC1
TC2
+7.0
-0.341
µV/ºC
µ
V/°C
2
VREF aging ±25
ppm/
year
VREF(T) deviation from VNOM(T)
62
10
)()(
6
VNOM
TVNOMTVREF −
Ta = -40ºC to +85ºC -40 +40
ppm/º
C
VBIAS voltage
Ta = 25 ºC
Ta = -40 ºC to 85 ºC
(-1%)
(-4%)
1.6
1.6
(+1%)
(+4%)
V
V
1
This relationship describes the nominal behavior of VREF at different temperatures.
4.4.11 LCD Drivers
The information in Table 18 applies to all COM and SEG pins.
Table 18: LCD Drivers Performance Specifications
Parameter
Condition
Min
Typ
Max
Unit
VLC2 Max Voltage With respect to VLCD -0.1 0+.1 V
VLC1 Voltage,
⅓ bias
½ bias
With respect to 2*VLC2/3
With respect to VLC2/2
-4
-3
0
+2
%
%
VLC0 Voltage,
⅓ bias
½ bias
With respect to VLC2/3
With respect to VLC2/2
-3
-3
+2
+2
%
%
VLCD is V3P3SYS in MISSION mode and VBAT in BROWNOUT and LCD modes.