AD7414 查看數據表（PDF） - Analog Devices

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AD7414

±0.5°C Accurate, 10-Bit Digital Temperature Sensors in SOT-23

Analog Devices 

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.

ADDRESS

POINTER

REGISTER

TEMPERATURE

VALUE

REGISTER

CONFIGURATION

REGISTER

D

A

T

THIGH

A

REGISTER

TLOW

REGISTER

SERIAL BUS INTERFACE

SDA

SCL

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.

ADDRESS

POINTER

REGISTER

TEMPERATURE

VALUE

REGISTER

D

A

T

CONFIGURATION

A

REGISTER

SDA

SCL

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.

AD7414/AD7415

Table 6. Address Pointer Register

P7 P6 P5 P4 P3 P2

000000

P1 P0

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

PD FLTR ALERT

EN

01 11

01

ALERT

POLARITY

01

ALERT

RESET

01

1 Default settings at power-up.

D2

ONE

SHOT

01

D1 D0

TEST

MODE

0s1

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 ONE SHOT TEST MODE

01 11

0s1

0s1

0s1

1 Default settings at power-up.

Rev. E | Page 9 of 20

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