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PCF8576CHL-1 Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCF8576CHL-1 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 57 page PCF8576C All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 10 — 22 July 2010 10 of 57 NXP Semiconductors PCF8576C Universal LCD driver for low multiplex rates The host microprocessor or microcontroller maintains the 2-line I2C-bus communication channel with the PCF8576C. 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 PCF8576C resets to the following starting conditions: • All backplane and segment outputs are set to VDD • The selected drive mode is 1:4 multiplex with 1⁄3 bias • Blinking is switched off • Input and output bank selectors are reset (as defined in Table 8) • The I2C-bus interface is initialized • The data pointer and the subaddress counter are cleared 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 The full-scale LCD voltage (Voper) is obtained from VDD − VLCD. The LCD voltage may be temperature compensated externally through the VLCD supply to pin VLCD. Fractional LCD biasing voltages are obtained from an internal voltage divider comprising three series resistors connected between VDD and VLCD. The center resistor can be switched out of the circuit to provide a 1 ⁄ 2 bias voltage level for the 1:2 multiplex configuration. Fig 7. Typical system configuration HOST MICRO- PROCESSOR/ MICRO- CONTROLLER R ≤ tr 2CB SDA SCL OSC 40 segment drives 4 backplanes LCD PANEL (up to 160 elements) PCF8576C A0 A1 A2 SS SA0 V VSS VDD DD V LCD V 013aaa098 |
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Similar Description - PCF8576CHL-1 |
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