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AS1100PE-Z Datasheet(PDF) 4 Page - ams AG |
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AS1100PE-Z Datasheet(HTML) 4 Page - ams AG |
4 / 12 page Data Sheet AS1100 Revision 1.32, Oct. 2004 Page 4 of 12 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X Address MSB Data LSB Table 1: Serial data format (16 bits) Detailed Description Serial-Addressing Modes Programming of the AS1100 is done via the 4 wire serial interface. A programming sequence consists of 16-bit packages. The data is shifted into the internal 16 Bit register with the rising edge of the CLK signal. With the rising edge of the LOAD signal the data is latched into a digital or control register depending on the address. The LOAD signal must go to high after the 16th rising clock edge. The LOAD signal can also come later but just before the next rising edge of CLK, otherwise data would be lost. The content of the internal shift register is applied 16.5 clock cycles later to the DOUT pin. The data is clocked out at the falling edge of CLK. The Bits of the 16Bit- programming package are described in table 1. The first 4 Bits D15-D12 are ”don’t care, D11-D8 contain the address and D7-D0 contain the data. The first bit is D15, the most significant bit (MSB). The exact timing is given in figure 1. Digit and Control Registers The AS1100 incorporates 15 registers, which are listed in Table 2. The digit and control registers are selected via the 4Bit address word. The 8 digit registers are realized with a 64bit memory. Each digit can be controlled directly without rewriting the whole contents. The control registers consist of decode mode, display intensity, number of scanned digits, shutdown, display test and reset/external clock register. Shutdown Mode The AS1100 features a shutdown mode, where it consumes only 20µA current. The shutdown mode is entered via a write to register 0Ch. Then all segment current sources are pulled to ground and all digit drivers are connected to VDD, so that nothing is displayed. All internal digit registers keep the programmed values. The shutdown mode can either be used for power saving or for generating a flashing display by repeatedly entering and leaving the shutdown mode. The AS1100 needs typically 250µs to exit the shutdown mode. During shutdown the AS1100 is fully programmable. Only the display test function overrides the shutdown mode. Initial Power-Up After powering up the system all register are reset, so that the display is blank. The AS1100 starts the shutdown mode. All registers should be programmed for normal operation. The default settings enable only scan of one digit, the internal decoder is disabled, data register and intensity register are set to the minimum value. Figure 1: Timing diagram LOAD CLK DIN DOUT tDS tDH tCL tCH D15 D14 D1 D0 tDO tCP tCS tLDCK tCSW |
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