Datasheet
ADT7316/ADT7317/ADT7318
Rev. B | Page 34 of 44
Manufacturer’s ID Register (Read-Only) [Address 0x4E]
This register contains the manufacturers identification number.
Analog Devices, Inc.’s ID is 0x41.
External T
LOW
Limit Register (Read/Write) [Address 0x28]
This limit register is an 8-bit, read/write register that stores the
twos complement of the external temperature lower limit that
causes an interrupt and activates the INT/
INT
output (if enabled).
For this to happen, the measured external temperature value
has to be more negative than or equal to the value in this regis-
ter. As it is an 8-bit register, the temperature resolution is 1°C.
The default value is 0°C.
Silicon Revision Register (Read-Only) [Address 0x4F]
T
his register is divided into the 4 LSBs representing the stepping
and the 4 MSBs representing the version. The stepping contains
the manufacturer’s code for minor revisions or steppings to the
silicon. The version is the ADT7316/ADT7317/ ADT7318
version number.
Positive Temperature = Li
mit Register Code (dec)
Negative Temperature = Limit Register Code (dec) – 256
SPI Lock Status Register (Read-Only) [Address 0x7F]
Bi
t D0 (LSB) of this read-only register indicates whether the SPI
interface is locked. Writing to this register causes the device to
malfunction. The default value is 0x00.
Table 57. External T
LOW
Limit
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
0 = I
2
C interface.
1 = SPI interface selected and locked.
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
Default settings at power-up.
Device ID Register (Read-Only) [Address 0x4D]
This 8-bit, read-only register indicates which part the device is
in the model range. ADT7316 = 0x01, ADT7317 = 0x09, and
ADT7318 = 0x05.
CS
SDA
SCL
ADD
V
DD
V
DD
I
2
C ADDRESS = 1001 000
10kΩ10kΩ
ADT7316/
ADT7317/
ADT7318
02661-049
Figure 48. Typical I
2
C Interface Connection
ADT7316/
ADT7317/
ADT7318
SCLK
DOUT
CS
V
DD
LOCK AND
SELECT SPI
SPI FRAMING
EDGE
820Ω 820Ω 820Ω
DIN
02661-050
Figure 49. Typical SPI Interface Connection