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PCF8578U Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCF8578U Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 44 page  1998 Sep 08 8 Philips Semiconductors Product specification LCD row/column driver for dot matrix graphic displays PCF8578 7 FUNCTIONAL DESCRIPTION The PCF8578 row/column driver is designed for use in one of three ways: • Stand-alone row/column driver for small displays (mixed mode) • Row/column driver with cascaded PCF8579s (mixed mode) • Row driver with cascaded PCF8579s (mixed mode). 7.1 Mixed mode In mixed mode, the device functions as both a row and column driver. It can be used in small stand-alone applications, or for larger displays with up to 15 PCF8579s (31 PCF8579s when two slave addresses are used). See Table 1 for common display configurations. 7.2 Row mode In row mode, the device functions as a row driver with up to 32 row outputs and provides the clock and synchronization signals for the PCF8579. Up to 16 PCF8579s can normally be cascaded (32 when two slave addresses are used). Timing signals are derived from the on-chip oscillator, whose frequency is determined by the value of the resistor connected between OSC and VSS. Commands sent on the I2C-bus from the host microcontroller set the mode (row or mixed), configuration (multiplex rate and number of rows and columns) and control the operation of the device. The device may have one of two slave addresses. The only difference between these slave addresses is the least significant bit, which is set by the logic level applied to SA0. The PCF8578 and PCF8579 also have subaddresses. The subaddress of the PCF8578 is only defined in mixed mode and is fixed at 0. The RAM may only be accessed in mixed mode and data is loaded as described for the PCF8579. Bias levels may be generated by an external potential divider with appropriate decoupling capacitors. For large displays, bias sources with high drive capability should be used. A typical mixed mode system operating with up to 15 PCF8579s is shown in Fig.5 (a stand-alone system would be identical but without the PCF8579s). Table 1 Possible displays configurations Notes 1. Using 15 PCF8579s. 2. Using 16 PCF8579s. APPLICATION MULTIPLEX RATE MIXED MODE ROW MODE TYPICAL APPLICATIONS ROWS COLUMNS ROWS COLUMNS Stand alone 1 : 8 8 32 −− small digital or alphanumerical displays 1:16 16 24 −− 1:24 24 16 −− 1:32 32 8 −− With PCF8579 1 : 8 8(1) 632(1) 8 × 44(2) 640(2) alphanumeric displays and dot matrix graphic displays 1:16 16(1) 624(1) 16 × 2(2) 640(2) 1:24 24(1) 616(1) 24(2) 640(2) 1:32 32(1) 608(1) 24(2) 640(2) |
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