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參數(shù)資料
| 型號： | PCF8535 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 65 x 133 pixel matrix driver |
| 中文描述： | 65 × 133像素矩陣驅(qū)動程序 |
| 文件頁數(shù)： | 12/52頁 |
| 文件大小： | 1765K |
| 代理商： | PCF8535 |
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1999 Aug 24
12
Philips Semiconductors
Objective specification
65
×
133 pixel matrix driver
PCF8535
Table 4
Example of LCD bias voltage for
1
/
7
bias, n = 3
7.11
Temperature measurement
7.11.1
T
EMPERATURE READ BACK
The PCF8535 has an in-built temperature sensor.
For power saving, the sensor should only be enabled
when a measurement is required. It will not operate in
power-down mode. The temperature read back requires a
clock to operate. Normally the internal clock is used but, if
the device is operating from an external clock, then this
must be present for the measurement to work. V
DD2
and
V
DD3
must also be applied. A measurement is initialized by
setting the SM bit. Once started the SM bit will be
automatically cleared. An internal oscillator will be
initialized and allowed to warm-up for approximately
2 frame periods. After this the measurement starts and
lasts for a maximum of 2 frame periods.
Temperature data is returned via a status register. During
the measurement the register will contain zero. Once the
measurement is completed the register will be updated
with the current temperature (non zero value). Because
the I
2
C-bus interface is asynchronous to the temperature
measurement, read back prior to the end of the
measurement is not guaranteed. If this mode is required
the register should be read twice to validate the data.
The ideal temperature read-out can be calculated as
follows;
(1)
where T is the on-chip temperature in
°
C and c is the
conversion constant; c = 1.17
°
C/lsb.
To improve the accuracy of the temperature measurement
a calibration is recommended during the assembly of the
final product.
For calibrating the temperature read-out a measurement
must be taken at a defined temperature. The offset
between the ideal read-out and the actual result has to be
stored into a non-volatile register (e.g. EEPROM);
Offset
TR
ideal
TR
meas
–
=
(2)
where TR
meas
is the actual temperature read-out of the
PCF8535.
The calibrated temperature read-out can be calculated for
each measurement as follows:
TR
cal
TR
meas
Offset
+
=
(3)
The accuracy after the calibration is
±
6.7% (plus
±
1 lsb) of
the difference between the current temperature and the
calibration temperature. For this reason a calibration at or
near the most sensitive temperature for the display is
recommended.
E.g. for a calibration at 25
°
C with the current temperature
at
20
°
C, the absolute error may be calculated as:
Absolute error = 0.067
×
(25
°
C
20
°
C)
=
±
3
°
C +
±
1 lsb =
±
4.17
°
C.
7.12
Temperature compensation
7.12.1
T
EMPERATURE COEFFICIENTS
Due to the temperature dependency of the liquid crystals
viscosity the LCD controlling voltage, V must be increased
at lower temperatures to maintain optimum contrast.
Figure 4 shows V
LCD
as a function of temperature for a
typical high multiplex rate liquid.
In the PCF8535 the temperature coefficient of V
LCD
can be
selected from 8 values by setting bits TC[2:0],
see Table 5.
SYMBOL
BIAS VOLTAGE FOR
1
/
7
BIAS
V
LCD
6
/
7
×
V
LCD
5
/
7
×
V
LCD
2
/
7
×
V
LCD
1
/
7
×
V
LCD
V
SS
V1
V2
V3
V4
V5
V6
TR
ideal
128
T
27
°
C
–
(
)
1
c
×
+
=
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