參數(shù)資料
型號: PCF85162T/1
廠商: NXP SEMICONDUCTORS
元件分類: 顯示驅(qū)動器
英文描述: LIQUID CRYSTAL DISPLAY DRIVER, PDSO48
封裝: 6.10 MM, PLASTIC, MO-153, SOT362-1, TSSOP-48
文件頁數(shù): 26/43頁
文件大小: 321K
代理商: PCF85162T/1
PCF85162_2
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 7 May 2010
32 of 43
NXP Semiconductors
PCF85162
Universal LCD driver for low multiplex rates
The SYNC line is provided to maintain the correct synchronization between all cascaded
PCF85162. Synchronization is guaranteed after a power-on reset. The only time that
SYNC is likely to be needed is if synchronization is accidentally lost (e.g. by noise in
adverse electrical environments or by defining a multiplex drive mode when PCF85162
with different SA0 levels are cascaded).
SYNC is organized as an input/output pin. The output selection is realized as an
open-drain driver with an internal pull-up resistor. A PCF85162 asserts the SYNC line at
the onset of its last active backplane signal and monitors the SYNC line at all other times.
If synchronization in the cascade is lost, it is restored by the first PCF85162 to assert
SYNC. The timing relationship between the backplane waveforms and the SYNC signal
for the various drive modes of the PCF85162 are shown in Figure 24.
The contact resistance between the SYNC on each cascaded device must be controlled.
If the resistance is too high, the device is not able to synchronize properly; this is
particularly applicable to chip-on-glass applications. The maximum SYNC contact
resistance allowed for the number of devices in cascade is given in Table 19.
(1) Is master (OSC connected to VSS).
(2) Is slave (OSC connected to VDD).
Fig 23. Cascaded PCF85162 configuration
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
SDA
SCL
CLK
OSC
SYNC
32 segment drives
4 backplanes
32 segment drives
LCD PANEL
PCA85162
A0
A1
A2
SA0
VSS
VDD
VDD
VLCD
VLCD
VDD
VLCD
013aaa058
SDA
SCL
SYNC
CLK
OSC
BP0 to BP3
(open-circuit)
A0
A1
A2
SA0
PCA85162
BP0 to BP3
R
tr
2Cb
(1)
(2)
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