ST7571 Sitronix Technology, ST7571 Datasheet - Page 58

• Manufacturer Part Number: ST7571
• Description: 4 Gray Scale Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

www.DataSheet4U.com
Vop
Voltage follower output voltage
VG output voltage range
ST7571
Internal Power Circuits
The operation ranges of the internal power circuits are shown below:
Internal Power Application Notes
l
l
l
l
l
l
l
Internal Power Application Summary (Recommend LCD Module Setting)
For quick reference, the following table lists some recommended settings for LCD module.
VDD1=1.8V, VDD2=2.8V, N-Line=12 (0x0A), Panel Size=1.5”
Note:
1.
2.
Ver 1.5a
It is recommended to reserve some range for user adjustment and temperature effect.
The value listed above is in the IC point of view. The liquid crystal display status should be checked by customer.
Positive Booster: (VDD2 x 8 x BE) ≥ V0 or (VDD2 x 8 x BE) ≥ Vop;
Negative Booster: [–VDD2 x (8 – 1) x BE] ≤ XV0 or [VDD2 x (8 – 1) x BE] ≥ (Vop – VG),
Vop requirement: [VDD2 x (8 – 1) x BE] ≥ [Vop x (N – 2) / N] or [Vop ≤ VDD2 x (8 – 1) x BE x N / (N – 2)].
“8” is the booster stage and BE is the booster efficiency. Actual BE should be determined by module loading and ITO
resistance value.
1.8V ≤ VG < VDD2. Recommend VG setting is: (VDD2-VG) = 0.5~0.8V.
VM=VG/2 and 0.7V ≤ VM < VDD2.
The worse condition should be considered. Furthermore, it should reserve some range for the temperature
compensation and the contrast control (for end-customer).
1/129
Duty
1/81
1/65
Item
8.5V ~ 10.5V
10V ~ 12V
9V ~ 11V
Vop
Symbol
V0-XV0
VM
VG
Condition
Bias
58/76
1/9
1/9
1/9
Min.
0.7
1.8
—
Rating
VG/2
Typ.
—
—
VDD2-0.7
VDD2
Max.
15
where VG = Vop x 2 / N;
Units
V
V
V
Applicable
2009/7/21
Pin