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ADS7845EG4 Datasheet(PDF) 9 Page - Texas Instruments |
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ADS7845EG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 16 page ® 9 ADS7845 single-ended mode, the converter’s reference voltage is always the difference between the VREF and GND pins. In differential mode, the reference voltage is the difference between the currently enabled switches. See Tables I and II and Figures 2 through 4 for more information. The last two bits (PD1 - PD0) select the power- down mode as shown in Table V. If both inputs are HIGH, the device is always powered up. If both inputs are LOW, the device enters a power-down mode between conversions. When a new con- version is initiated, the device will resume normal operation instantly—no delay is needed to allow the device to power up and the very first conversion will be valid. There are two power-down modes: one where PENIRQ is disabled and one where it is enabled. PD1 PD0 PENIRQ DESCRIPTION 0 0 Enabled Power-down between conversions. When each conversion is finished, the converter enters a LOW power mode. At the start of the next con- version, the device instantly powers up to full power. There is no need for additional delays to assure full operation and the very first conversion is valid. The LR– switch is on while in power-down. 0 1 Disabled Same as mode 00, except PENIRQ is disabled. The LR– switch is off while in power-down mode. 1 0 Disabled Reserved for future use. 1 1 Disabled No power down between conversions, device is always powered. FIGURE 5. Conversion Timing, 24 Clocks per Conversion, 8-Bit Bus Interface. No DCLK Delay Required with Dedicated Serial Port. TABLE V. Power-Down Selection. FIGURE 6. Conversion Timing, 16 Clocks per Conversion, 8-Bit Bus Interface. No DCLK Delay Required with Dedicated Serial Port. 1 DCLK CS 81 11 DOUT BUSY S DIN CONTROL BITS S CONTROL BITS 10 98765 4 3210 11 10 9 81 1 8 t ACQ Acquire Idle Conversion Idle 1 DCLK CS 81 11 DOUT BUSY DRIVERS 1 AND 2(1) (SER/DFR HIGH) DRIVERS 1 AND 2(1, 2) (SER/DFR LOW) (MSB) (START) (LSB) A2 S ON ON OFF OFF OFF OFF DIN A1 A0 MODE SER/ DFR PD1 PD0 10 98765 4 3210 Zero Filled... 81 8 NOTES: (1) For Y Position, Driver 1 is ON and Driver 2 is OFF. For X Position, Driver 1 is OFF and Driver 2 is ON. LR will turn on when power-down mode is entered and PD1, PD0 = 00B. (2) Drivers will remain on if power-down mode is 11B (no power down) until selected input channel, reference mode, or power-down mode is changed, or CS is HIGH. |
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