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AD7414ARMZ-0REEL7 데이터시트(PDF) 9 Page - Analog Devices |
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AD7414ARMZ-0REEL7 데이터시트(HTML) 9 Page - Analog Devices |
9 / 20 page ![]() AD7414/AD7415 Rev. F | Page 9 of 20 INTERNAL REGISTER STRUCTURE The AD7414 has five internal registers, as shown in Figure 8. Four are data registers, and one is an address pointer register. SDA SCL TEMPERATURE VALUE REGISTER CONFIGURATION REGISTER THIGH REGISTER TLOW REGISTER D A T A ADDRESS POINTER REGISTER SERIAL BUS INTERFACE Figure 8. AD7414 Register Structure The AD7415 has three internal registers, as shown in Figure 9. Two are data registers, and one is an address pointer register. SDA SCL D A T A TEMPERATURE VALUE REGISTER CONFIGURATION REGISTER ADDRESS POINTER REGISTER Figure 9. AD7415 Register Structure Each data register has an address pointed to by the address pointer register when communicating with it. The temperature value register is the only data register that is read-only. ADDRESS POINTER REGISTER The address pointer register is an 8-bit register that stores an address that points to one of the four data registers of the AD7414 and one of the two data registers of the AD7415. The first byte of every serial write operation to the AD7414/AD7415 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 register are used to select a data register. Table 6. Address Pointer Register P7 P6 P5 P4 P3 P2 P1 P0 0 0 0 0 0 0 Register Select Table 7. AD7414 Register Address P1 P0 Register 0 0 Temperature value register (read-only) 0 1 Configuration register (read/write) 1 0 THIGH register (read/write) 1 1 TLOW register (read/write) Table 8. AD7415 Register Address P1 P0 Registers 0 0 Temperature value register (read-only) 0 1 Configuration register (read/write) Table 9. AD7414 Configuration Register D7 D6 D5 D4 D3 D2 D1 D0 PD FLTR ALERT EN ALERT POLARITY ALERT RESET ONE SHOT TEST MODE 01 11 01 01 01 01 0s1 1 Default settings at power-up. CONFIGURATION REGISTER (ADDRESS 0X01) The configuration register is an 8-bit read/write register that is 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 modes (see Table 10). D0 and D1 are used for factory settings and must have zeros written to them during normal operation. Table 10. AD7414 Configuration Register Settings D7 Full power-down if = 1. D6 Bypass SDA and SCL filtering if = 0. D5 Disable ALERT if = 1. D4 ALERT is active low if D4 = 0, ALERT is active high if D4 = 1. D3 Reset the ALERT pin if set to 1. The next temperature conversion has the ability to activate the ALERT function. The bit status is not stored; thus this bit is 0 if read. D2 Initiate a one shot temperature conversion if set to a 1. The bit status is not stored; thus this bit is 0 if read. Table 11. AD7415 Configuration Register D7 D6 D5 D4 D3 D2 D1 D0 PD FLTR TEST MODE 0s1 ONE SHOT TEST MODE 01 11 0s1 0s1 1 Default settings at power-up. |
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