ADT7518
 
Rev. A | Page 33 of 40 
AIN2 V
LOW
 Limit Register (Read/Write) [Address = 2Ch] 
This limit register is an 8-bit read/write register that stores the 
AIN2 input lower 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 less than or equal to 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 0 V. 
 
Table 54. AIN2 V
LOW
 Limit 
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0*  
0*  
0*  
0*  
0* 
0*  
0*  
0*  
* Default settings at power-up 
AIN3 V
HIGH
 Limit Register (Read/Write) [Address = 2Dh] 
This limit register is an 8-bit read/write register that stores the 
AIN3 input upper limit, which will cause an interrupt and acti-
vate the INT/INT
 output (if enabled). For this to happen, the 
measured AIN3 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 55. AIN3 VHIGH Limit 
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
1*  
1*  
1*  
1*  
1*  
1*  
1*  
1*  
* Default settings at power-up 
AIN3 VLOW Limit Register (Read/Write) [Address = 2Eh] 
This limit register is an 8-bit read/write register that stores the 
AIN3 input lower limit, which will cause an interrupt and 
activate the INT/INT
 output (if enabled). For this to happen, 
the measured AIN3 value has to be less than or equal to the 
value in this register. Because it is an 8-bit register, the reso-
lution is four times less than the resolution of the 10-bit ADC. 
The default value is 0 V. 
Table 56. AIN3 V
LOW
 Limit 
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0*  
0* 
0*  
0*  
0*  
0*  
0*  
0*  
* Default settings at power-up 
AIN4 VHIGH Limit Register (Read/Write) [Address = 2Fh] 
This limit register is an 8-bit read/write register that stores the 
AIN4 input upper limit, which will cause an interrupt and acti-
vate the INT/
INT
 output (if enabled). For this to happen, the 
measured AIN4 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 57. AIN4 VHIGH Limit 
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
1*  
1*  
1*  
1*  
1*  
1*  
1*  
1*  
* Default settings at power-up 
AIN4 V
LOW
 Limit Register (Read/Write) [Address = 30h] 
This limit register is an 8-bit read/write register that stores the 
AIN4 input lower limit, which will cause an interrupt and 
activate the INT/INT
 output (if enabled). For this to happen, 
the measured AIN4 value has to be less than or equal to the 
value in this register. Because it is an 8-bit register, the reso-
lution is four times less than the resolution of the 10-bit ADC. 
The default value is 0 V. 
Table 58. AIN4 VLOW Limit 
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0*  
0*  
0*  
0*  
0*  
0*  
0*  
0*  
* Default settings at power-up 
Device ID Register (Read-Only) [Address = 4Dh] 
This 8-bit read-only register contains a device identifier byte: 
ADT7518 = 0Bh. 
Manufacturers ID Register (Read-Only) [Address = 4Eh] 
This register contains the manufacturers identification number. 
ADIs ID number is 41h. 
Silicon Revision Register (Read-Only) [Address = 4Fh] 
This register is divided into four LSBs representing the stepping 
and the four MSBs representing the version. The stepping con-
tains the manufacturers code for minor revisions or steppings 
to the silicon. The version is the ADT7518 version number. 
SPI Lock Status Register (Read-Only) [Address = 7Fh] 
Bit D0 (LSB) of this read-only register indicates whether or not 
the SPI interface is locked. Writing to this register will cause the 
device to malfunction. The default value is 00h. 
0 = I
2
C interface. 
1 = SPI interface selected and locked. 
SERIAL INTERFACE  
There are two serial interfaces that can be used on this part: I
2
C 
and SPI. The device will power up with the serial interface in 
I
2
C mode, but it is not locked into this mode. To stay in I
2
C 
mode, it is recommended that the user tie the CS
 line to either 
V
CC
 or GND. It is not possible to lock the I
2
C mode, but it is 
possible to select and lock the SPI mode.