PCA85134 查看數據表（PDF） - NXP Semiconductors.
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PCA85134 Datasheet PDF : 53 Pages
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NXP Semiconductors
PCA85134
Automotive 60 x 4 LCD segment driver for low multiplex rates
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Fig 4. Typical system configuration
The host microcontroller maintains the 2-line I2C-bus communication channel with the
PCA85134.
Biasing voltages for the multiplexed LCD waveforms are generated internally, removing
the need for an external bias generator. The internal oscillator is selected by connecting
pin OSC to VSS. The only other connections required to complete the system are the
power supplies (pins VDD, VSS, and VLCD) and the LCD panel selected for the application.
7.1 Power-On Reset (POR)
At power-on the PCA85134 resets to the following starting conditions:
• All backplane and segment outputs are set to VLCD
• The selected drive mode is: 1:4 multiplex with 1⁄3 bias
• Blinking is switched off
• Input and output bank selectors are reset
• The I2C-bus interface is initialized
• The data pointer and the subaddress counter are cleared (set to logic 0)
• The display is disabled (bit E = 0, see Table 12)
Remark: Do not transfer data on the I2C-bus for at least 1 ms after a power-on to allow
the reset action to complete.
7.2 LCD bias generator
Fractional LCD biasing voltages are obtained from an internal voltage divider consisting of
three impedances connected in series between VLCD and VSS. If the 1⁄2 bias voltage level
for the 1:2 multiplex drive mode configuration is selected, the center impedance is
bypassed by switch. The LCD voltage can be temperature compensated externally, using
the supply to pin VLCD.
PCA85134
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 6 May 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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