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SA8806A Datasheet(PDF) 8 Page - Sames |
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SA8806A Datasheet(HTML) 8 Page - Sames |
8 / 10 page SA8806A 8/10 sames 3. LCD Character Mapping The device has 16 address locations, A0 - A15 which correspond to VS[0] - VS[15]. Each location contains 4 bits, D[3] to D[0] which correspond to VR[3] - VR[0]. The mapping is detailed in the table below: SEG VS[0] VS[1] VS[2] VS[3] ........ VS[12] VS[13] VS[14] VS[15] VR[0] 0-0 1-0* 2-0 3-0 ........ 12-0 13-0 14-0 15-0 VR[1] 0-1 1-1 2-1 3-1 ........ 12-1 13-1 14-1 15-1 VR[2] 0-2 1-2 2-2 3-2 ........ 12-2 13-2 14-2 15-2 VR[3] 0-3 1-3 2-3 3-3 ........ 12-3 13-3 14-3 15-3 Note: A '1' switches the corresponding segment on. * The address number and bit number of the byte is given, e.g. 1-0 is address 1 and bit 0 (LSB). 4. On-Chip LCD Voltage Divider Disable The integrated divider for the LCD voltages can be disabled by applying a high level on the EN input (EN = 1). 5. Contrast Setting The contrast may be adjusted in two ways: An external resistor divider supplying the LCD voltage inputs VI1, VI1/3, VI2/3, with the internal divider disabled as described in paragraph 4. Applying an external LCD voltage on input V1, with the internal voltage divider activated. 6. Oscillator The on-chip oscillator circuit requires one external capacitor for operation. The capacitor value is calculated as follows: C = 7µF.1Hz/f f = Required oscillator frequency The multiplex rate is 64 times lower than the clock frequency. TYPICAL APPLICATION The Application Circuit (Figure 1) shows the connections for a typical application utilising an 8 digit (7 segment) display, plus decimal points. |
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