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AD7417ARU-REEL7 Datasheet(PDF) 13 Page - Analog Devices |
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AD7417ARU-REEL7 Datasheet(HTML) 13 Page - Analog Devices |
13 / 24 page AD7416/AD7417/AD7418 Rev. I | Page 13 of 24 Table 8. Register Addresses P2 P1 P0 Registers 0 0 0 Temperature value 0 0 1 Configuration register 0 1 0 THYST setpoint 0 1 1 TOTI setpoint 1 0 0 ADC value (AD7417/AD7418 only) 1 0 1 Config2 (AD7417/AD7418 only) Temperature Value Register (Address 0x00) The temperature value register is a 16-bit, read-only register whose 10 MSBs store the temperature reading from the ADC in 10-bit twos complement format. Bit D5 to Bit D0 are unused. Table 9. Temperature Value Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 MSB B8 B7 B6 B5 B4 B3 B2 B1 LSB The temperature data format is shown in Table 10. This shows the full theoretical range of the ADC from −128°C to +127°C, but in practice, the temperature measurement range is limited to the operating temperature range of the device. Table 10. Temperature Data Format Temperature Digital Output −128°C 10 0000 0000 −125°C 10 0000 1100 −100°C 10 0111 0000 −75°C 10 1101 0100 −50°C 11 0011 1000 −25°C 11 1001 1100 −10°C 11 1101 1000 −0.25°C 11 1111 1111 0°C 00 0000 0000 +0.25°C 00 0000 0001 +10°C 00 0010 1000 +25°C 00 0110 0100 +50°C 00 1100 1000 +75°C 01 0010 1100 +100°C 01 1001 0000 +125°C 01 1111 0100 +127°C 01 1111 1100 Configuration Register (Address 0x01) The configuration register is an 8-bit, read/write register that is used to set the operating modes of the AD7416/AD7417/AD7418. Bit D7 to Bit D5 control the channel selection as outlined in Table 12. Bits[D7:D5] should always be set to 000 for the AD7416. Bit D4 and Bit D3 are used to set the length of the fault queue. D2 sets the sense of the OTI output. D1 selects the comparator or interrupt mode of operation, and D0 = 1 selects the shutdown mode (default: D0 = 0). Table 11. Configuration Register D7 D6 D5 D4 D3 D2 D1 D0 Channel selection Fault queue OTI polarity Cmp/Int Shutdown The AD7416 contains a temperature-only channel; the AD7417 has four analog input channels and a temperature channel; and the AD7418 has two channels, a temperature channel, and an analog input channel. The temperature channel address for all parts is the same, Channel 0. The address for the analog input channel on the AD7418 is Channel 4. Table 12 outlines the channel selection on the parts, and Table 13 shows the fault queue settings. D1 and D2 are explained in the OTI Output section. Table 12. Channel Selection D7 D6 D5 Channel Selection 0 0 0 Temperature sensor (all parts), Channel 0 0 0 1 AIN1 (AD7417 only), Channel 1 0 1 0 AIN2 (AD7417 only), Channel 2 0 1 1 AIN3 (AD7417 only), Channel 3 1 0 0 AIN4 (AD7417) and AIN (AD7418), Channel 4 Table 13. Fault Queue Settings D4 D3 Number of Faults 0 0 1 (power-up default) 0 1 2 1 0 4 1 1 6 THYST Setpoint Register (Address 0x02) The THYST setpoint register is a 16-bit, read/write register whose nine MSBs store the THYST setpoint in twos complement format equivalent to the nine MSBs of the temperature value register. Bit D6 to Bit D0 are unused. TOTI Setpoint Register (Address 0x03) The TOTI setpoint register is a 16-bit, read/write register whose nine MSBs store the TOTI setpoint in twos complement format equivalent to the nine MSBs of the temperature value register. Bit 6 to Bit 0 are unused. Table 14. THYST Setpoint and TOTI Setpoint Registers D15 D14 D13 D12 D11 D10 D9 D8 D7 MSB B7 B6 B5 B4 B3 B2 B1 LSB ADC Value Register (Address 0x04) The ADC value register is a 16-bit, read-only register whose 10 MSBs store the value produced by the ADC in binary format. Bit D5 to Bit D0 are unused. Table 15 shows the ADC value register with 10 MSBs containing the ADC conversion request. Table 15. ADC Value Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 MSB B8 B7 B6 B5 B4 B3 B2 B1 LSB ADC Transfer Function The designed code transitions occur at successive integer LSB values (that is, 1 LSB, 2 LSB, and so on). The LSB size = VREF/1024. The ideal transfer function characteristic for the AD7417 and AD7418 ADC is shown in Figure 14. |
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