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AS1108 Datasheet(PDF) 10 Page - ams AG |
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AS1108 Datasheet(HTML) 10 Page - ams AG |
10 / 21 page www.austriamicrosystems.com/LED-Driver-ICs/AS1108 Revision 2.13 9 - 20 AS1108 Datasheet - D e t a i l e d D e s c r i p t i o n Shutdown Mode The AS1108 features a shutdown mode, consuming only 10µA (max) current. Shutdown mode is entered via a write to the Shutdown Register (see Table 8). At that point, all segment current sources are pulled to ground and all digit driv- ers are connected to VDD, so that all segments are blanked. Note: During shutdown mode the Digit-Registers maintain their data. Shutdown mode can either be used as a means to reduce power consumption or for generating a flashing display (repeatedly entering and leaving shutdown mode). For minimum supply current in shutdown mode, logic input should be at GND or VDD (CMOS logic level). The device needs typically 250µs to exit shutdown mode, and during shutdown mode the AS1108 is fully programma- ble. Only the display test mode (see page 11) overrides shutdown mode. When entering or leaving shutdown mode, the Feature Register is reset to its default values (all 0s) when Shutdown Register bit D7 (page 10) = 0. When bit D7 = 1, the Feature Register is left unchanged when entering or leaving shut- down mode. Note: If the AS1108 is used with an external clock, Shutdown Register bit D7 should be set to 1 when writing to the Shutdown Register. Digit- and Control-Registers The AS1108 contains four Digit-Registers and six control-registers, which are listed in Table 7. All registers are selected using a 4-bit address word, and communication is done via the serial interface. Digit Registers – These registers are realized with an on-chip 32-bit memory. Each digit can be controlled directly without rewriting the whole register contents. Control Registers – These registers consist of decode mode, display intensity, number of scanned digits, shut- down, display test and features selection registers. Table 7. Register Address Map Register HEX Code Address Page D15:D12 D11 D10 D9 D8 No-Op 0xX0 X 0 0 0 0 13 Digit 0 0xX1 X 0 0 0 1 N/A Digit 1 0xX2 X 0 0 1 0 N/A Digit 2 0xX3 X 0 0 1 1 N/A Digit 3 0xX4 X 0 1 0 0 N/A Decode-Mode 0xX9 X 1 0 0 1 10 Intensity Control 0xXA X 1 0 1 0 12 Scan Limit 0xXB X 1 0 1 1 12 Shutdown 0xXC X 1 1 0 0 10 N/A 0xXD X 1 1 0 1 N/A Feature 0xXE X 1 1 1 0 13 Display Test 0xXF X 1 1 1 1 11 |
Similar Part No. - AS1108_12 |
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Similar Description - AS1108_12 |
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