44.14 SLCD Characteristics

The values in the table below are measured values of power consumption under the following conditions, except where noted:
  • T=25°C. Standby Mode. Low Power waveform Mode. Frame Rate = 32Hz from ULP32K Oscillator.
  • No ACM, ABM or Segment Animation Features activated
  • All Segments on, No Glass Load = 0pF and With Glass Load = 22pF on each COM and SEG line.
  • Contrast Adjustment CTST control set to 0x7 (~2.97V) when using internal VLCD generation
  • No Bias Buffer. No External Bias Output. No Low Resistance Network Enable
  • Reference Refresh Frequency = 500Hz. Power Refresh Frequency = 1kHz
  • ILCD current based on ILCD = Istdby(LCD On) - Istdby (LCD Off). with Istdby = IVDD + IVDDANA
  • To minimize power consumption of the SLCD module use VLCD = VDD or VLCD > VDD + 0.4V
Table 44-50. Liquid Crystal Display Controller Characteristics
SymbolParameterConditionsTaMin.Typ.Max.Units
VDDPower Supply for SLCD operation1.623.33.63V
VLCDVLCD maximum valueVDD=1.62V, Contrast Adjustment: CTST = 0xFIload = 10µA

Max 85°C

Typ 25°C

2.943.053.15V
Iload = 20µA2.782.973.13
VDD=1.8V, Contrast Adjustment: CTST = 0xFIload = 10µA3.323.443.55
Iload = 20µA.3.173.363.53
VDD>2V, Contrast Adjustment: CTST = 0xFIload = 10µA3.323.483.71
Iload = 20µA.3.283.453.69
CVLCDExternal VLCD capacitor-1-µF
FframeLCD Frame Frequency-32120Hz
TstartVLCD Start-up TimeVDD=2.4V, CTST=0x7-25-ms
VLCDLCD Regulated VoltagesContrast Adjustment: CTST = 0x7-3-V
BIAS3/4-3*VLCD/4-
BIAS1/2-VLCD/2-
BIAS1/4-VLCD/4-
BIAS2/3-2*VLCD/3-
BIAS1/3-VLCD/3-
ILCDLCD current supply With no Glass (Load = 0pF)Internal VLCD generationNb COM = 8 Nb SEG = 40 (1/4 Bias)VDD = 3.6V

Max 85°C

Typ 25°C

1.685.97µA
VDD = 2.4V2.4115.34
Nb COM = 4 Nb SEG = 44 (1/3 Bias)VDD = 3.6V1.636.61
VDD = 2.4V2.2816.86
Nb COM = 1 Nb SEG = 44 (Static Bias)VDD = 3.6V1.205.97
VDD = 2.4V1.2515.24
External VLCD generation (VLCD = 3.0V)Nb COM = 8 Nb SEG = 40 (1/4 Bias)VDD = 3.6V1.035.76
VDD = 2.4V1.257.30
Nb COM = 4 Nb SEG = 44 (1/3 Bias)VDD = 3.6V1.065.66
VDD = 2.4V1.267.39
Nb COM = 1 Nb SEG = 44 (Static Bias)VDD = 3.6V1.075.81
VDD = 2.4V1.227.04
ILCDLCD current supply With Glass (Load = 22pF)Internal VLCD generationNb COM = 8 Nb SEG = 40 (1/4 Bias)VDD = 3.6V

Max 85°C

Typ 25°C

3.028.06µA
VDD = 2.4V4.8418.44
Nb COM = 4 Nb SEG = 44 (1/3 Bias)VDD = 3.6V2.448.22
VDD = 2.4V3.8417.64
Nb COM = 1 Nb SEG = 44 (Static Bias)VDD = 3.6V1.786.86
VDD = 2.4V1.9915.23
External VLCD generation (VLCD = 3.0V)Nb COM = 8 Nb SEG = 40 (1/4 Bias)VDD = 3.6V

Max 85°C

Typ 25°C

1.095.96
VDD = 2.4V1.256.62
Nb COM = 4 Nb SEG = 44 (1/3 Bias)VDD = 3.6V1.066.34
VDD = 2.4V1.278.41
Nb COM = 1 Nb SEG = 44 (Static Bias)VDD = 3.6V1.236.38
VDD = 2.4V1.228.00
Table 44-51. Liquid Crystal Display Contrast Values (VLCD)
SymbolParameterConditionsCTRLC.CTST valueTyp.Units
VLCDContrast VLCD Values

Iload = 20µA

VDD>2V

VLCD generated internally

0x02.45V
0x12.51
0x22.57
0x32.64
0x42.71
0x52.78
0x62.84
0x72.91
0x82.98
0x93.04
0xA3.11
0xB3.18
0xC3.25
0xD3.31
0xE3.38
0xF3.45