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STE2002 Datasheet(Hoja de datos) 6 Page - STMicroelectronics

No. de Pieza. STE2002
Descripción  81 X 128 SINGLE CHIP LCD CONTROLLER / DRIVER
Descarga  51 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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 6 page
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STE2002
6/51
CIRCUIT DESCRIPTION
Supplies Voltages and Grounds
VDD2 is supply voltages to the internal voltage generator (see below). If the internal voltage generator is
not used, this should be connected to VDD1 pad. VDD1 supplies the rest of the IC. VDD1 supply voltage
could be different form VDD2.
Internal Supply Voltage Generator
The IC has a fully integrated (no external capacitors required) charge pump for the Liquid Crystal Display
supply voltage generation. The multiplying factor can be programmed to be: Auto, X6, X5, X4, X3, X2, us-
ing the ’set CP Multiplication’ Command. If Auto is set, the multiplying factor is automatically selected to
have the lowest current consumption in every condition. This make possible to have an input voltage that
changes over time and a constant VLCD voltage. The output voltage (VLCDOUT) is tightly controlled through
the VLCDSENSE pad. For this voltage, eight different temperature coefficients (TC, rate of change with tem-
perature) can be programmed using the bits TC1 and TC0 and T2,T1 & T0. This will ensure no contrast
degradation over the LCD operating range. Using the internal charge pump, the VLCDIN and VLCDOUT pads
must be connected together. An external supply could be connected to VLCDIN to supply the LCD without
using the internal generator. In such event the VLDCOUT and VLCDSENSE must be connected to GND and
the internal voltage generator must be programmed to zero (PRS = [0;0], Vop = 0 - Reset condition).
Oscillator
A fully integrated oscillator (requires no external components) is present to provide the clock for the Dis-
play System. When used the OSC pad must be connected to VDD1 pad. An external oscillator could be
used and fed into the OSC pin. An oscillator out is provided on the OSCOUT Pad to cascade two or more
drivers
Bias Levels
To properly drive the LCD, six (Including VLCD and VSS) different voltage (Bias) levels are generated.
The ratios among these levels and VLCD, should be selected according to the MUX ratio (m). They are
established to be (Fig. 4):
Figure 4. Bias level Generator
thus providing an 1/(n+4) ratio, with n calculated from:
For m = 81, n = 6 and an 1/10 ratio is set.
For m = 65, n =5 and an 1/9 ratio is set.
V
LC D
n3
+
n4
+
------------- V
LC D ,
n2
+
n4
+
------------- V
LC D ,
2
n4
+
------------- V
LC D ,
1
n4
+
------------- V
LC D ,VSS
,
R
VLCD
VSS
·VLCD
·VLCD
·VLCD
·VLCD
n + 3
n + 4
R
nR
R
R
n + 2
n + 4
2
n + 4
1
n + 4
D00IN1150
nm
3
=




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