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PCF8576DU/2DA/2 Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCF8576DU/2DA/2 Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 57 page PCF8576D All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 14 — 10 June 2013 8 of 57 NXP Semiconductors PCF8576D Universal LCD driver for low multiplex rates The host microcontroller maintains the 2-line I2C-bus communication channel with the PCF8576D. The internal oscillator is enabled by connecting pin OSC to pin VSS. The appropriate biasing voltages for the multiplexed LCD waveforms are generated internally. The only other connections required to complete the system are to the power supplies (VDD, VSS, and VLCD) and the LCD panel chosen for the application. 7.1 Power-On Reset (POR) At power-on the PCF8576D 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 of three impedances connected between pins VLCD and VSS. The center impedance is bypassed by switch if the 1⁄2 bias voltage level for the 1:2 multiplex drive mode configuration is selected. The LCD voltage can be temperature compensated externally using the supply to pin VLCD. The resistance of the power lines must be kept to a minimum. For chip-on-glass applications, due to the Indium Tin Oxide (ITO) track resistance, each supply line must be routed separately between the chip and the connector. Fig 5. Typical system configuration HOST MICRO- PROCESSOR/ MICRO- CONTROLLER tr 2CB SDA SCL OSC 40 segment drives 4 backplanes LCD PANEL (up to 160 elements) PCF8576D A0 A1 A2 SA0 VDD VSS VSS VDD VLCD mdb079 R ≤ |
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