Datasheet AD7414, AD7415 (Analog Devices) - 10
| 制造商 | Analog Devices |
| 描述 | ±0.5°C Accurate, 10-Bit Digital Temperature Sensors in SOT-23 |
| 页数 / 页 | 19 / 10 — AD7414/. AD7415. Data Sheet. Table 13. Temperature Value Register (First … |
| 修订版 | G |
| 文件格式/大小 | PDF / 250 Kb |
| 文件语言 | 英语 |
AD7414/. AD7415. Data Sheet. Table 13. Temperature Value Register (First Read). D15 D14 D13 D12 D11 D10 D9 D8
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AD7414/ AD7415 Data Sheet
In the AD7415, only three of the bits are used (D7, D6, and D2)
Table 13. Temperature Value Register (First Read)
to set the operating modes (see Table 12). D0, D1, and D3 to D5
D15 D14 D13 D12 D11 D10 D9 D8
are used for factory settings and must have zeros written to MSB B8 B7 B6 B5 B4 B3 B2 them during normal operation.
Table 12. AD7415 Configuration Register Settings Table 14. AD7414 Temperature Value Register (Second Read)
D7 Full power-down if = 1.
D7 D6 D5 D4 D3 D2 D1 D0
D6 Bypass SDA and SCL filtering if = 0. D2 Initiate a one-shot temperature conversion if set to 1. B1 LSB ALERT_ THIGH_Flag TLOW_Flag 0 0 0 Flag 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
Table 15. AD7415 Temperature Value Register (Second Read)
operation. This involves a write operation to the configuration
D7 D6 D5 D4 D3 D2 D1 D0
register and setting the one-shot bit to 1 (D2 = 1), which causes B1 LSB N/A N/A N/A N/A N/A N/A the AD7414/AD7415 to power up, perform a single conversion, and power down again. This is a very power efficient mode.
AD7414 THIGH REGISTER (ADDRESS 0X02) TEMPERATURE VALUE REGISTER (ADDRESS 0X00)
The THIGH register (see Table 16) is an 8-bit, read/write register The temperature value register is a 10-bit, read-only register that stores the upper limit that activates the ALERT output. that stores the temperature reading from the ADC in twos Therefore, if the value in the temperature value register is complement format. Two reads are necessary to read data from greater than the value in the THIGH register, the ALERT pin is this register. Table 13 shows the contents of the first byte to be activated (that is, if ALERT is enabled in the configuration read, while Table 14 and Table 15 show the contents of the register). Because it is an 8-bit register, the temperature second byte to be read from the AD7414 and AD7415, resolution is 1°C. respectively. In Table 14, D3 to D5 of the second byte are used as flag bits and are obtained from other internal registers. They
Table 16. THIGH Register
function as follows:
D7 D6 D5 D4 D3 D2 D1 D0
ALERT_Flag: The state of this bit is the same as that of the MSB B6 B5 B4 B3 B2 B1 B0 ALERT pin. THIGH_Flag: This flag is set to 1 when the temperature
AD7414 TLOW REGISTER (ADDRESS 0X03)
measured goes above the THIGH limit. It is reset The TLOW register (see Table 17) is an 8-bit read/write register when the second temperature byte (Table 14) is that stores the lower limit that deactivates the ALERT output. read. If the temperature is still greater than the Therefore, if the value in the temperature value register is less THIGH limit after the read operation, the flag is again. than the value in the TLOW register, the ALERT pin is deactivated TLOW_Flag: This flag is set to 1 when the temperature (that is, if ALERT is enabled in the configuration register). measured goes below the TLOW limit. It is reset Because it is an 8-bit register, the temperature resolution is 1°C. when the second temperature byte (Table 14) is read. If the temperature is still less than the TLOW
Table 17. TLOW Register
limit after the read operation, the flag is set again.
D7 D6 D5 D4 D3 D2 D1 D0
The full theoretical span of the ADC is 255°C, but in practice MSB B6 B5 B4 B3 B2 B1 B0 the temperature measurement range is limited to the operating range of the device, −40°C to +125°C for the A grade. Rev. G | Page 10 of 19 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS THEORY OF OPERATION CIRCUIT INFORMATION FUNCTIONAL DESCRIPTION MEASUREMENT TECHNIQUE TEMPERATURE DATA FORMAT INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER CONFIGURATION REGISTER (ADDRESS 0x01) TEMPERATURE VALUE REGISTER (ADDRESS 0x00) AD7414 THIGH REGISTER (ADDRESS 0X02) AD7414 TLOW REGISTER (ADDRESS 0x03) SERIAL INTERFACE SERIAL BUS ADDRESS WRITE MODE Writing to the Address Pointer Register for a Subsequent Read Writing a Single Byte of Data to the Configuration Register, THIGH Register, or TLOW Register READ MODE SMBUS ALERT POWER-ON DEFAULTS OPERATING MODES Mode 1 Mode 2 POWER VS. THROUGHPUT Mode 1 Mode 2 MOUNTING THE AD7414/AD7415 SUPPLY DECOUPLING TEMPERATURE ACCURACY VS. SUPPLY TYPICAL TEMPERATURE ERROR GRAPH OUTLINE DIMENSIONS ORDERING GUIDE
AD7414/ AD7415 Data Sheet
In the AD7415, only three of the bits are used (D7, D6, and D2)
Table 13. Temperature Value Register (First Read)
to set the operating modes (see Table 12). D0, D1, and D3 to D5
D15 D14 D13 D12 D11 D10 D9 D8
are used for factory settings and must have zeros written to MSB B8 B7 B6 B5 B4 B3 B2 them during normal operation.
Table 12. AD7415 Configuration Register Settings Table 14. AD7414 Temperature Value Register (Second Read)
D7 Full power-down if = 1.
D7 D6 D5 D4 D3 D2 D1 D0
D6 Bypass SDA and SCL filtering if = 0. D2 Initiate a one-shot temperature conversion if set to 1. B1 LSB ALERT_ THIGH_Flag TLOW_Flag 0 0 0 Flag 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
Table 15. AD7415 Temperature Value Register (Second Read)
operation. This involves a write operation to the configuration
D7 D6 D5 D4 D3 D2 D1 D0
register and setting the one-shot bit to 1 (D2 = 1), which causes B1 LSB N/A N/A N/A N/A N/A N/A the AD7414/AD7415 to power up, perform a single conversion, and power down again. This is a very power efficient mode.
AD7414 THIGH REGISTER (ADDRESS 0X02) TEMPERATURE VALUE REGISTER (ADDRESS 0X00)
The THIGH register (see Table 16) is an 8-bit, read/write register The temperature value register is a 10-bit, read-only register that stores the upper limit that activates the ALERT output. that stores the temperature reading from the ADC in twos Therefore, if the value in the temperature value register is complement format. Two reads are necessary to read data from greater than the value in the THIGH register, the ALERT pin is this register. Table 13 shows the contents of the first byte to be activated (that is, if ALERT is enabled in the configuration read, while Table 14 and Table 15 show the contents of the register). Because it is an 8-bit register, the temperature second byte to be read from the AD7414 and AD7415, resolution is 1°C. respectively. In Table 14, D3 to D5 of the second byte are used as flag bits and are obtained from other internal registers. They
Table 16. THIGH Register
function as follows:
D7 D6 D5 D4 D3 D2 D1 D0
ALERT_Flag: The state of this bit is the same as that of the MSB B6 B5 B4 B3 B2 B1 B0 ALERT pin. THIGH_Flag: This flag is set to 1 when the temperature
AD7414 TLOW REGISTER (ADDRESS 0X03)
measured goes above the THIGH limit. It is reset The TLOW register (see Table 17) is an 8-bit read/write register when the second temperature byte (Table 14) is that stores the lower limit that deactivates the ALERT output. read. If the temperature is still greater than the Therefore, if the value in the temperature value register is less THIGH limit after the read operation, the flag is again. than the value in the TLOW register, the ALERT pin is deactivated TLOW_Flag: This flag is set to 1 when the temperature (that is, if ALERT is enabled in the configuration register). measured goes below the TLOW limit. It is reset Because it is an 8-bit register, the temperature resolution is 1°C. when the second temperature byte (Table 14) is read. If the temperature is still less than the TLOW
Table 17. TLOW Register
limit after the read operation, the flag is set again.
D7 D6 D5 D4 D3 D2 D1 D0
The full theoretical span of the ADC is 255°C, but in practice MSB B6 B5 B4 B3 B2 B1 B0 the temperature measurement range is limited to the operating range of the device, −40°C to +125°C for the A grade. Rev. G | Page 10 of 19 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS THEORY OF OPERATION CIRCUIT INFORMATION FUNCTIONAL DESCRIPTION MEASUREMENT TECHNIQUE TEMPERATURE DATA FORMAT INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER CONFIGURATION REGISTER (ADDRESS 0x01) TEMPERATURE VALUE REGISTER (ADDRESS 0x00) AD7414 THIGH REGISTER (ADDRESS 0X02) AD7414 TLOW REGISTER (ADDRESS 0x03) SERIAL INTERFACE SERIAL BUS ADDRESS WRITE MODE Writing to the Address Pointer Register for a Subsequent Read Writing a Single Byte of Data to the Configuration Register, THIGH Register, or TLOW Register READ MODE SMBUS ALERT POWER-ON DEFAULTS OPERATING MODES Mode 1 Mode 2 POWER VS. THROUGHPUT Mode 1 Mode 2 MOUNTING THE AD7414/AD7415 SUPPLY DECOUPLING TEMPERATURE ACCURACY VS. SUPPLY TYPICAL TEMPERATURE ERROR GRAPH OUTLINE DIMENSIONS ORDERING GUIDE