AD7414 Analog Devices, Inc., AD7414 Datasheet - Page 9

• Manufacturer Part Number: AD7414
• Description: ?0.5c Accurate, 10-bit Digital Temperature Sensors In Sot-23
• Manufacturer: Analog Devices, Inc.

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.
The AD7415 has three internal registers, as shown in Figure 9.
Two are data registers, and one is an address pointer register.
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.
REGISTER
ADDRESS
POINTER
REGISTER
ADDRESS
POINTER
SERIAL BUS INTERFACE
Figure 8. AD7414 Register Structure
Figure 9. AD7415 Register Structure
CONFIGURATION
TEMPERATURE
REGISTER
REGISTER
CONFIGURATION
TEMPERATURE
VALUE
REGISTER
REGISTER
REGISTER
REGISTER
VALUE
T
T
HIGH
LOW
D
A
A
T
D
A
A
T
SDA
SCL
SDA
SCL
Rev. E | Page 9 of 20
Table 6. Address Pointer Register
P7
0
Table 7. AD7414 Register Address
P1
0
0
1
1
Table 8. AD7415 Register Address
P1
0
0
Table 9. AD7414 Configuration Register
D7
PD
0
1
CONFIGURATION REGISTER (ADDRESS 0
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
D6
D5
D4
D3
D2
Table 11. AD7415 Configuration Register
D7
PD
0
1
Default settings at power-up.
Default settings at power-up.
1
1
Full power-down if = 1.
Bypass SDA and SCL filtering if = 0.
Disable ALERT if = 1.
ALERT is active low if D4 = 0, ALERT is active high if D4 = 1.
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.
Initiate a one shot temperature conversion if set to a 1.
The bit status is not stored; thus this bit is 0 if read.
D6
FLTR
1
D6
FLTR
1
P0
0
1
0
1
P0
0
1
1
P6
0
1
Temperature value register (read-only)
Configuration register (read/write)
Temperature value register (read-only)
Configuration register (read/write)
D5
ALERT
EN
0
Register
T
T
Registers
D5
P5
0
HIGH
LOW
1
TEST MODE
register (read/write)
register (read/write)
D4
0s
P4
0
1
D4
ALERT
POLARITY
0
1
D3
P3
0
D2
ONE SHOT
0s
1
P2
0
D3
ALERT
RESET
0
1
AD7414/AD7415
P1
Register Select
D1
TEST MODE
0s
D2
ONE
SHOT
0
1
1
X
P0
01)
D0
D1 D0
TEST
MODE
0s
1