ADT7516 datasheet(28/44 Pages) AD

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ADT7516/ADT7517/ADT7519

Rev. B | Page 28 of 44

Table 9. Temperature Data Format

(Internal and External Temperature)

Temperature

Digital Output

–40°C

11 0110 0000

–25°C

11 1001 1100

–10°C

11 1101 1000

–0.25°C

11 1111 1111

0°C

00 0000 0000

+0.25°C

00 0000 0001

+10°C

00 0010 1000

+25°C

00 0110 0100

+50°C

00 1100 1000

+75°C

01 0010 1100

+100°C

01 1001 0000

+105°C

01 1010 0100

+125°C

01 1111 0100

Temperature conversion formula:

Positive Temperature = ADC Code/4

Negative Temperature = (ADC Code – 512)/4

where DB9 is removed from the ADC Code in the Negative

Temperature equation.

Interrupts

The measured results from the internal temperature sensor,

external temperature sensor, VDD pin, and AIN inputs are

compared with the THIGH/VHIGH (greater than comparison) and

TLOW/VLOW (less than or equal to comparison) limits. An

interrupt occurs if the measurement exceeds or equals the limit

registers. These limits are stored in on-chip registers. Note that

the limit registers are 8 bits long and the conversion results are

10 bits long. If the limits are not masked, any out-of-limit

comparisons generate flags that are stored in the Interrupt

Status 1 register (Address 0x00) and Interrupt Status 2 register

(Address 0x01). One or more out-of-limit results cause the

INT/INT output to pull either high or low depending on the

output polarity setting. It is good design practice to mask out

interrupts for channels that are of no concern to the application.

Figure 53 shows the interrupt structure for the ADT7516/

ADT7517/ADT7519. It gives a block diagram representation of

how the various measurement channels affect the INT/INT pin.

ADT7516/ADT7517/ADT7519 REGISTERS

The ADT7516/ADT7517/ADT7519 contain registers that are

used to store the results of external and internal temperature

measurements, VDD value measurements, analog input measure-

ments, high and low temperature limits, supply voltage and

analog input limits, set output DAC voltage levels, configure

multipurpose pins, and generally to control the device. A

description of these registers follows.

The register map is divided into registers of 8 bits. Each register

has its own individual address, but some consist of data that is

linked with other registers. These registers hold the 10-bit

conversion results of measurements taken on the temperature,

VDD, and AIN channels. For example, the eight MSBs of the VDD

measurement are stored in Register Address 0x06 and the two

LSBs are stored in Register Address 0x03. These types of

registers are linked so that when the LSB register is read first,

the MSB registers associated with that LSB register are locked to

prevent any updates. To unlock these MSB registers, the user only

has to read any one of them; this has the effect of unlocking all

previously locked MSB registers. Therefore, for the preceding

example, if Register 0x03 is read first, MSB Register 0x06 and

If Register 0x06 is read, this register and Register 0x07 would be

subsequently unlocked.

LOCK ASSOCIATED

MSB REGISTERS

FIRST READ

COMMAND

LSB

OUTPUT

DATA

Figure 55. Phase 1 of 10-Bit Read

UNLOCK ASSOCIATED

MSB REGISTERS

SECOND READ

COMMAND

MSB

OUTPUT

DATA

Figure 56. Phase 2 of 10-Bit Read

If an MSB register is read first, its corresponding LSB register is

not locked, leaving the user with the option of just reading back

8 bits (MSB) of a 10-bit conversion result. Reading an MSB

reading an LSB register first does not lock other LSB registers.

Table 10. ADT7516/ADT7517/ADT7519 Registers

R/W

Address

Name

Power-On

Default

0x00

Interrupt Status 1

0x00

0x01

Interrupt Status 2

0x00

0x02

Reserved

0x03

Internal Temp and VDD LSBs

0x00

0x04

External Temp and AIN1 to AIN4 LSBs

0x00

0x05

Reserved

0x00

0x06

VDD MSBs

No default value

0x07

Internal Temp MSBs

0x00

0x08

External Temp MSBs/AIN1 MSBs

0x00

0x09

AIN2 MSBs

0x00

0x0A

AIN3 MSBs

0x00

0x0B

AIN4 MSBs

0x00

0x0C to

0x0F

Reserved

0x00

0x10

DAC A LSBs (ADT7516/ADT7517 Only)

0x00

0x11

DAC A MSBs

0x00

0x12

DAC B LSBs (ADT7516/ADT7517 Only)

0x00

0x13

DAC B MSBs

0x00

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