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AD7414ARTZ-2REEL Fiches technique(PDF) 10 Page - Analog Devices |
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AD7414ARTZ-2REEL Fiches technique(HTML) 10 Page - Analog Devices |
10 / 20 page AD7414/AD7415 Rev. F | Page 10 of 20 In the AD7415, only three of the bits are used (D7, D6, and D2) to set the operating modes (see Table 12). D0, D1, and D3 to D5 are used for factory settings and must have zeros written to them during normal operation. Table 12. AD7415 Configuration Register Settings D7 Full power-down if = 1. D6 Bypass SDA and SCL filtering if = 0. D2 Initiate a one-shot temperature conversion if set to 1. The bit status is not stored; thus this bit is 0 if read. If the AD7414/AD7415 are in power-down mode (D7 = 1), a temperature conversion can still be initiated by the one-shot operation. This involves a write operation to the configuration register and setting the one-shot bit to 1 (D2 = 1), which causes the AD7414/AD7415 to power up, perform a single conversion, and power down again. This is a very power efficient mode. TEMPERATURE VALUE REGISTER (ADDRESS 0X00) The temperature value register is a 10-bit, read-only register that stores the temperature reading from the ADC in twos complement format. Two reads are necessary to read data from this register. Table 13 shows the contents of the first byte to be read, while Table 14 and Table 15 show the contents of the second byte to be read from the AD7414 and AD7415, respectively. In Table 14, D3 to D5 of the second byte are used as flag bits and are obtained from other internal registers. They function as follows: ALERT_Flag: The state of this bit is the same as that of the ALERT pin. THIGH_Flag: This flag is set to 1 when the temperature measured goes above the THIGH limit. It is reset when the second temperature byte (Table 14) is read. If the temperature is still greater than the THIGH limit after the read operation, the flag is again. TLOW_Flag: This flag is set to 1 when the temperature measured goes below the TLOW limit. It is reset when the second temperature byte (Table 14) is read. If the temperature is still less than the TLOW limit after the read operation, the flag is set again. The full theoretical span of the ADC is 255°C, but in practice the temperature measurement range is limited to the operating range of the device, −40°C to +125°C for the A grade. Table 13. Temperature Value Register (First Read) D15 D14 D13 D12 D11 D10 D9 D8 MSB B8 B7 B6 B5 B4 B3 B2 Table 14. AD7414 Temperature Value Register (Second Read) D7 D6 D5 D4 D3 D2 D1 D0 B1 LSB ALERT_Flag THIGH_Flag TLOW_Flag 0 0 0 Table 15. AD7415 Temperature Value Register (Second Read) D7 D6 D5 D4 D3 D2 D1 D0 B1 LSB N/A N/A N/A N/A N/A N/A AD7414 THIGH REGISTER (ADDRESS 0X02) The THIGH register (see Table 16) is an 8-bit, read/write register that stores the upper limit that activates the ALERT output. Therefore, if the value in the temperature value register is greater than the value in the THIGH register, the ALERT pin is activated (that is, if ALERT is enabled in the configuration register). Because it is an 8-bit register, the temperature resolution is 1°C. Table 16. THIGH Register D7 D6 D5 D4 D3 D2 D1 D0 MSB B6 B5 B4 B3 B2 B1 B0 AD7414 TLOW REGISTER (ADDRESS 0X03) The TLOW register (see Table 17) is an 8-bit read/write register that stores the lower limit that deactivates the ALERT output. Therefore, if the value in the temperature value register is less than the value in the TLOW register, the ALERT pin is deactivated (that is, if ALERT is enabled in the configuration register). Because it is an 8-bit register, the temperature resolution is 1°C. Table 17. TLOW Register D7 D6 D5 D4 D3 D2 D1 D0 MSB B6 B5 B4 B3 B2 B1 B0 |
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