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AD7417AR Datasheet(PDF) 11 Page - Analog Devices |
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AD7417AR Datasheet(HTML) 11 Page - Analog Devices |
11 / 20 page REV. G AD7416/AD7417/AD7418 –11– CONFIGURATION REGISTER (ADDRESS 01h) The Configuration Register is an 8-bit, read/write register that is used to set the operating modes of the AD7416/AD7417/ AD7418. Bits D7 to D5 control the channel selection as outlined in Table VI. These bits should always be 0, 0, 0 for the AD7416. Bits D4 and 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 V. Configuration Register D7 D6 D5 D4 D3 D2 D1 D0 Channel Fault OTI Cmp/ Shut- Selection Queue Polarity Int down 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 chan- nel address for all parts is the same, CH0. The address for the analog input channel on the AD7418 is CH4. Table VI outlines the channel selection on the parts, while Table VII shows the fault queue settings. D1 and D2 are explained in the OTI Out- put section. Table VI. Channel Selection D7 D6 D5 Channel Selection 00 0Temperature Sensor (All Parts) 00 1 AIN1 (AD7417 Only) 01 0 AIN2 (AD7417 Only) 01 1 AIN3 (AD7417 Only) 10 0 AIN4 (AD7417) and AIN (AD7418) Table VII. Fault Queue Settings D4 D3 Number of Faults 00 1 (Power-Up Default) 01 2 10 4 11 6 THYST SETPOINT REGISTER (ADDRESS 02h) The THYST Setpoint Register is a 16-bit, read/write register whose nine MSBs store the THYST setpoint in twos complement for- mat equivalent to the nine MSBs of the Temperature Value Register. Bits 6 to 0 are unused. TOTI SETPOINT REGISTER (ADDRESS 03h) 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. Bits 6 to 0 are unused. Table VIII. Setpoint Registers D15 D14 D13 D12 D11 D10 D9 D8 D7 MSB B7 B6 B5 B4 B3 B2 B1 LSB ADC VALUE REGISTER (ADDRESS 04h) The ADC Value Register is a 16-bit, read-only register whose 10 MSBs store the value produced by the ADC in binary for- mat. Bits 5 to 0 are unused. Table IX shows the ADC Value Register with 10 MSBs containing the ADC conversion request. Table IX. 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 (i.e., 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 7. 111...111 111...110 111...000 011...111 000...010 000...001 000...000 0V 1/2LSB +VREF – 1LSB ANALOG INPUT 1LSB = V REF/1024 Figure 7. Ideal Transfer Function Characteristic for the AD7417/AD7418 CONFIG2 REGISTER (ADDRESS 05h) A second configuration register is included in the AD7417/ AD7418 for the functionality of the CONVST pin. It is an 8-bit register with Bits D5 to D0 being left at 0. Bit D7 determines whether the AD7417/AD7418 should be operated in its default mode (D7 = 0), performing conversions every 355 µs or in its CONVST pin mode (D7 = 1), where conversions will start only when the CONVST pin is used. Bit 6 contains the Test 1 Bit. When this bit is 0, the I2C filters are enabled (default). A 1 disables the filters. Table X. CONFIG2 Register D7 D6 D5 D4 D3 D2 D1 D0 Conversion Mode Test 1 0 0 0 0 0 0 SERIAL BUS INTERFACE Control of the AD7416/AD7417/AD7418 is carried out via the I2C compatible serial bus. The AD7416/AD7417/AD7418 is connected to this bus as a slave device, under the control of a master device, e.g., the processor. SERIAL BUS ADDRESS As with all I 2C compatible devices, the AD7416/AD7417/AD7418 have a 7-bit serial address. The four MSBs of this address for the AD7416 are set to 1001; the AD7417 are set to 0101, while the three LSBs can be set by the user by connecting the A2 to A0 pins to either VDD or GND. By giving them different addresses, up to eight AD7416/AD7417s can be connected to a single serial bus, |
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