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ADT7518
V
DD
V
LOW
Limit Register (Read/Write) [Address = 24h]
This limit register is an 8-bit read/write register that stores the
V
DD
lower limit, which will cause an interrupt and activate the
INT/INT output (if enabled). For this to happen, the measured
V
DD
value has to be less than or equal to the value in this
register. The default value is 2.7 V.
Table 48. V
DD
V
LOW
Limit
D7
D6
D5
D4
D7
D6
D5
D4
0*
1*
1*
0*
*
Default settings at power-up
Internal T
HIGH
Limit Register (Read/Write) [Address = 25h]
This limit register is an 8-bit read/write register that stores the
twos complement of the internal temperature upper limit,
which will cause an interrupt and activate the INT/INT output
(if enabled). For this to happen, the measured internal temp-
erature value has to be greater than the value in this register.
Because it is an 8-bit register, the temperature resolution is 1°C.
The default value is +100°C.
Rev. A | Page 32 of 40
D3
D3
0*
D2
D2
0*
D1
D1
1*
D0
D0
0*
Table 49. Internal T
HIGH
Limit
D7
D6
D7
D6
0*
1*
*
Default settings at power-up
Internal T
LOW
Limit Register (Read/Write) [Address = 26h]
This limit register is an 8-bit read/write register that stores the
twos complement of the internal temperature lower limit, which
will cause an interrupt and activate the INT/INT output (if
enabled). For this to happen, the measured internal temperature
value has to be more negative than or equal to the value in this
register. Because it is an 8-bit register, the temperature reso-
lution is 1°C. The default value is –55°C.
D5
D5
1*
D4
D4
0*
D3
D3
0*
D2
D2
1*
D1
D1
0*
D0
D0
0*
Table 50. Internal T
LOW
Limit
D7
D6
D7
D6
1*
1*
*
Default settings at power-up
External T
HIGH
/AIN1 V
HIGH
Limit Register (Read/Write)
[Address = 27h]
If Pins 7 and 8 are configured for the external temperature
sensor, this limit register is an 8-bit read/write register that
stores the twos complement of the external temperature upper
limit, which will cause an interrupt and activate the INT/INT
output (if enabled). For this to happen, the measured external
temperature value has to be greater than the value in this reg-
ister. Because it is an 8-bit register, the temperature resolution is
1°C. The default value is –1°C.
D5
D5
0*
D4
D4
0*
D3
D3
1*
D2
D2
0*
D1
D1
0*
D0
D0
1*
If Pins 7 and 8 are configured for AIN1 and AIN2 inputs, this
limit register is an 8-bit read/write register that stores the AIN1
input upper limit, which will cause an interrupt and activate the
INT/INT output (if enabled). For this to happen, the measured
AIN1 value has to be greater than the value in this register.
Because it is an 8-bit register, the resolution is four times less
than the resolution of the 10-bit ADC. Because the power-up
default settings for Pins 7 and 8 are AIN1 and AIN2 inputs, the
default value for this limit register is full-scale voltage.
Table 51. AIN1 V
HIGH
Limit
D7
D6
D7
D6
1*
1*
*
Default settings at power-up
External T
LOW
/AIN1 V
LOW
Limit Register (Read/Write)
[Address = 28h]
If Pins 7 and 8 are configured for the external temperature
sensor, this limit register is an 8-bit read/write register that
stores the twos complement of the external temperature lower
limit, which will cause an interrupt and activate 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 register. Because it is an 8-bit register, the temp-
erature resolution is 1°C. The default value is 0°C.
D5
D5
1*
D4
D4
1*
D3
D3
1*
D2
D2
1*
D1
D1
1*
D0
D0
1*
If Pins 7 and 8 are configured for AIN1 and AIN2 inputs, this
limit register is an 8-bit read/write register that stores the AIN1
input lower limit, which will cause an interrupt and activate the
INT/INT output (if enabled). For this to happen, the measured
AIN1 value has to be less than or equal to the value in this reg-
ister. As it is an 8-bit register, the resolution is four times less
than the resolution of the 10-bit ADC. Because the power-up
default settings for Pins 7 and 8 are AIN1 and AIN2 inputs, the
default value for this limit register is 0 V.
Table 52. AIN1 V
LOW
Limit
D7
D6
D7
D6
0*
0*
D5
D5
0*
D4
D4
0*
D3
D3
0*
D2
D2
0*
D1
D1
0*
D0
D0
0*
*
Default settings at power-up
AIN2 V
HIGH
Limit Register (Read/Write) [Address = 2Bh]
This limit register is an 8-bit read/write register that stores the
AIN2 input upper limit, which will cause an interrupt and acti-
vate the INT/INT output (if enabled). For this to happen, the
measured AIN2 value has to be greater than the value in this
register. Because it is an 8-bit register, the resolution is four
times less than the resolution of the 10-bit ADC. The default
value is full-scale voltage.
Table 53. AIN2 V
HIGH
Limit
D7
D6
D5
D4
D7
D6
D5
D4
1*
1*
1*
1*
*
Default settings at power-up
D3
D3
1*
D2
D2
1*
D1
D1
1*
D0
D0
1*