Datasheet AD7414, AD7415 (Analog Devices) - 9

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Data Sheet AD7414/ AD7415 INTERNAL REGISTER STRUCTURE
The AD7414 has five internal registers, as shown in Figure 8.
Table 6. Address Pointer Register
Four are data registers, and one is an address pointer register.
P7 P6 P5 P4 P3 P2 P1 P0
0 0 0 0 0 0 Register Select
TEMPERATURE VALUE REGISTER Table 7. AD7414 Register Address P1 P0 Register CONFIGURATION REGISTER
0 0 Temperature value register (read-only)
D ADDRESS
0 1 Configuration register (read/write)
A POINTER T REGISTER
1 0 THIGH register (read/write)
A THIGH
1 1 T
REGISTER
LOW register (read/write)
TLOW Table 8. AD7415 Register Address REGISTER P1 P0 Registers
0 0 Temperature value register (read-only)
SDA
0 1 Configuration register (read/write)
SERIAL BUS INTERFACE SCL
02463-008 Figure 8. AD7414 Register Structure
Table 9. AD7414 Configuration Register
The AD7415 has three internal registers, as shown in Figure 9.
D7 D6 D5 D4 D3 D2 D1 D0
Two are data registers, and one is an address pointer register. PD FLTR ALERT ALERT ALERT ONE TEST EN POLARITY RESET SHOT MODE 01 11 01 01 01 01 0s1
TEMPERATURE VALUE
1
REGISTER
Default settings at power-up.
ADDRESS D POINTER CONFIGURATION REGISTER (ADDRESS 0 A X01) REGISTER T CONFIGURATION A
The configuration register is an 8-bit read/write register that is
REGISTER
used to set the operating modes of the AD7414/AD7415. In the AD7414, six of the MSBs are used (D7 to D2) to set the operating
SDA
modes (see Table 10). D0 and D1 are used for factory settings
SCL
and must have zeros written to them during normal operation. 02463-009 Figure 9. AD7415 Register Structure
Table 10. AD7414 Configuration Register Settings
Each data register has an address pointed to by the address D7 Full power-down if = 1. pointer register when communicating with it. The temperature D6 Bypass SDA and SCL filtering if = 0. value register is the only data register that is read-only. D5 Disable ALERT if = 1. D4 ALERT is active low if D4 = 0, ALERT is active high if D4 = 1.
ADDRESS POINTER REGISTER
D3 Reset the ALERT pin if set to 1. The next temperature The address pointer register is an 8-bit register that stores an conversion has the ability to activate the ALERT function. address that points to one of the four data registers of the The bit status is not stored; thus this bit is 0 if read. AD7414 and one of the two data registers of the AD7415. The D2 Initiate a one shot temperature conversion if set to a 1. first byte of every serial write operation to the AD7414/AD7415 The bit status is not stored; thus this bit is 0 if read. 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 2 LSBs of this
Table 11. AD7415 Configuration Register
register are used to select a data register.
D7 D6 D5 D4 D3 D2 D1 D0
PD FLTR TEST MODE ONE SHOT TEST MODE 01 11 0s1 0s1 0s1 1 Default settings at power-up. Rev. G | Page 9 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