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AD7417AR Datasheet(PDF) 10 Page - Analog Devices |
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AD7417AR Datasheet(HTML) 10 Page - Analog Devices |
10 / 20 page REV. G –10– AD7416/AD7417/AD7418 ADDRESS POINTER REGISTER The Address Pointer Register is an 8-bit register that stores an address that points to one of the six data registers. The first data byte of every serial write operation to the AD7416/AD7417/ AD7418 is the address of one of the data registers, which is stored in the Address Pointer Register, and selects the data register to which subsequent data bytes are written. Only the three LSBs of this register are used to select a data register. Table I. Address Pointer Register P7 * P6 * P5 * P4 * P3 * P2 P1 P0 00 00 0 Register Select *P3 to P7 must be set to 0. Table II. Register Addresses P2 P1 P0 Registers 0 00Temperature Value (Read-Only) 0 01Config Register (Read/Write) 0 10THYST (Read/Write) 0 11TOTI 1 00 ADC (AD7417/AD7418 Only) 1 01Config2 (AD7417/AD7418 Only) TEMPERATURE VALUE REGISTER (ADDRESS 00h) 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. Bits 5 to 0 are unused. Table III. 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 IV. 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 IV. 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 –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 Figure 5 shows the method the AD7416/AD7417/AD7418 uses to measure the device temperature. To measure VBE, the sen- sor (substrate transistor) is switched between operating currents of I and N × I. The resulting waveform is passed through a chopper-stabilized amplifier that performs the functions of amplification and rectification of the waveform to produce a dc voltage proportional to VBE. This voltage is measured by the ADC to give a temperature output in 10-bit twos complement form. The temperature resolution of the ADC is 0.25 °C, which corre- sponds to 1 LSB of the ADC. The ADC can theoretically measure a temperature span of 255 °C; the guaranteed temperature range is –40 °C to +125°C. The result of the conversion is stored in the Temperature Value Register (00h) as a 16-bit word. The 10 MSBs of this word store the temperature measurement (see Table III and Table IV). The temperature conversion formula using the 10 MSBs of the Temperature Value Register is 1. Positive Temperature = ADC Code/4 2. Negative Temperature = (ADC Code * – 512)/4 *MSB is removed from the ADC Code. INTERNAL REGISTER STRUCTURE The AD7417/AD7418 has seven internal registers, as shown in Figure 6. Six of these are data registers and one is an Address Pointer Register. The AD7416 has five internal registers (the ADC and Config2 Registers are not applicable to the AD7416). THYST SETPOINT REGISTER (READ/WRITE ADDRESS 02h) CONFIGURATION REGISTER (READ/WRITE ADDRESS 01h) TOTI SETPOINT REGISTER (READ/WRITE ADDRESS 03h) SERIAL BUS INTERFACE SCL TEMPERATURE VALUE REGISTER (READ-ONLY ADDRESS 00h) ADDRESS POINTER REGISTER (SELECTS DATA REGISTER FOR READ/WRITE) ADDRESS DATA CONFIG2 REGISTER (READ/WRITE ADDRESS 05h) ADC REGISTER (READ-ONLY ADDRESS 04h) SDA Figure 6. AD7417/AD7418 Register Structure |
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