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AS1108 Datasheet(PDF) 3 Page - ams AG |
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AS1108 Datasheet(HTML) 3 Page - ams AG |
3 / 21 page www.austriamicrosystems.com/LED-Driver-ICs/AS1108 Revision 2.13 2 - 20 AS1108 Datasheet - P i n o u t 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name Description 1 DOUT Serial-Data Output. The data into pin DIN is valid at pin DOUT 16.5 clock cycles later. This pin is used to daisy-chain several AS1108 devices and is never high-impedance. 2 DIN Serial-Data Input. Data is loaded into the internal 16-bit shift register on the rising edge of pin CLK. 3, 5, 6, 8 DIG 0:DIG 3 Digit Drive Lines. 4 four-digit drive lines that sink current from the display common cathode. The AS1108 pulls the digit outputs to VDD when turned off. 4, 7 GND Ground. Both GND pins must be connected. 9 LOAD/CSN Load-Data Input. The last 16 bits of serial data are latched on the rising edge of this pin. Chip-Select Input (AS1108 SPI-enabled only). Serial data is loaded into the shift register while this pin is low. The last 16 bits of serial data are latched on the rising edge of this pin. 10 CLK Serial-Clock Input. 10MHz maximum rate. Data is shifted into the internal shift register on the rising edge of this pin. Data is clocked out of DOUT on the falling edge of this pin. On the AS1108 SPI-enabled, the CLK input is active only while pin LOAD/CSN is low. 11, 12, 13, 14, 17, 18, 19, 20 SEG A:SEG G, SEG DP Seven Segment and Decimal Point Drive Lines. 8 seven-segment drives and decimal point drive that source current to the display. When a segment driver is turned off it is pulled to GND. 15 ISET Set Segment Current. Connect to VDD through RSET to set the peak segment current (see Selecting RSET Resistor Value and Using External Drivers on page 14). 16 VDD Positive Supply Voltage. Connect to +2.7 to +5.5V supply. 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 SEG D SEG DP SEG E SEG C VDD ISET SEG G SEG B SEG F SEG A DOUT DIN DIG 0 GND DIG 2 DIG 3 GND DIG 1 LOAD/CSN CLK AS1108 |
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