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GP521 データシート(PDF) 5 Page - Gennum Corporation |
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GP521 データシート(HTML) 5 Page - Gennum Corporation |
5 / 8 page 5 510 - 79 - 06 1 2 3 4 5 6 7 8 17 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 17 16 15 14 13 12 11 10 9 Similarly if OS1 is high, I O2 and IO4 are set as high impedance points. This allows PCS I O1 and IO3 to sink current. I O1 - IO8 - Each pin is the output of the specific Programmable Current Sink (PCS). Each PCS consists of four bit EEPROM memory, Digital to Analog Converter (DAC) and current sink. The EEPROM stores the four bit information written during initialization of the system. Four bit memory allows for 16 settings of the current sink. For simplicity, consider the current sink as a variable resistor. The value of this resistor is dependent on the DAC setting; DAC is controlled by the binary value of the RAM memory. To define output current of the current sink, it is necessary to set the voltage applied to the PCS output. This voltage is recommended to be 0.5 V. If the binary value of the EEPROM increases by one, the value of the output current increases by 0.125 x I R . I R - The reference current delivered from the outside source (eg. GP520A). This current determines the incremental value of the programmable current sink for each increase of the EEPROM address value. The valid addresses run from 0 through to 15. Each step is defined as ∆I = I R x 0.125, therefore maximum current at setting 15 is equal to I 15 = I R x 0.125 x 15. CLOCK - The clock pulses for synchronization of the data transfer. The clock pulses are provided by the programming unit. DATA - The input / output pin allow for serial data transfer between the GP521 and the programming unit. V CC - Recommended supply voltage for GP521 is 1.3V SWOFF - The logic state of SWOFF determines whether the GP521 operates at 6 or 8 PCS configuration. When SWOFF is high, all eight ( I O1 to I O8 ) PCS are available (8 PCS configuration) Figure 10. PIN DESCRIPTION GP521 CLOCK DATA V CC GND OS1 SWOFF I o4 I o3 I o5 NC I o6 I o7 I o1 I o8 I o2 I R NC Fig.10 EIGHT OUTPUT CONFIGURATION When SWOFF is low, four PCS (I O5 to I O8 ) are available; availablility of other two PCS is dependent on the voltage on pin OS1. For this configuration (6 PCS configuration) the necessary hardware connections are presented in Figure 11. DATA V CC GND I R NC OSI GP521 I o4 I o3 I o5 NC I o6 I o7 I o1 I o8 I o2 SWOFF Fig. 11 SIX OUTPUT CONFIGURATION CLOCK OS1 - The voltage level on this pin determines the selection of four PCS ( I O1 to IO4) for 6 PCS configuration. As indicated on Figure 11, pin I O1, IO2 and IO3, IO4 are connected together. If OS1 is low, I O1 and IO3 are set to high impedance. Therefore the PCS, I O2 and IO4 are permitted to sink current. TABLE 1 EFFECTS OF SWOFF AND OS1 INPUTS SWOFF OS1 OUTPUT PCS Register Address 0 1 ( I O1 and I O3 )* (0001000 and 0001010) 0 0 ( I O2 and I O4 )* (0001001 and 0001011) 1x I O1 0001000 1x I O2 0001001 1x I O3 0001010 1x I O4 0001011 xx I O5 0001100 xx I O6 0001101 xx I O7 0001110 xx I O8 0001110 Note* The complementary outputs are set as high impedance points. |
同様の部品番号 - GP521 |
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同様の説明 - GP521 |
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