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參數資料
| 型號： | ADT7516ARQ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SPI/I2C Compatible, Temperature Sensor, Four Channel ADC and Quad Voltage Output DAC |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 16Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數： | 28/44頁 |
| 文件大小： | 1350K |
| 代理商： | ADT7516ARQ-REEL7 |
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ADT7516/ADT7517/ADT7519
Table 9. Temperature Data Format (Internal and External
Temperature)
Temperature
–40°C
–25°C
–10°C
–0.25°C
0°C
+0.25°C
+10°C
+25°C
+50°C
+75°C
+100°C
+105°C
+125°C
Rev. A | Page 28 of 44
Digital Output
11 0110 0000
11 1001 1100
11 1101 1000
11 1111 1111
00 0000 0000
00 0000 0001
00 0010 1000
00 0110 0100
00 1100 1000
01 0010 1100
01 1001 0000
01 1010 0100
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.
Interrupts
The measured results from the internal temperature sensor,
external temperature sensor, V
DD
pin, and AIN inputs are
compared with the T
HIGH
/V
HIGH
(greater than comparison) and
T
LOW
/V
LOW
(less than or equal to comparison) limits. An inter-
rupt 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 while the conversion results are
10 bits long. If the limits are not masked, any out-of-limit com-
parisons generate flags that are stored in the Interrupt Status 1
register (Address 00h) and Interrupt Status 2 register
(Address 01h). One or more out-of-limit results will 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, V
DD
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,
V
DD
, and AIN channels. For example, the eight MSBs of the V
DD
measurement are stored in register Address 06h while the two
LSBs are stored in register Address 03h. The link involved
between these types of registers is 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 has only to read any one of them, which will have the
effect of unlocking all previously locked MSB registers. So for
the preceding example, if Register 03h was read first, MSB
Registers 06h and 07h would be locked to prevent any updates
to them. If Register 06h was read, this register and Register 07h
would be subsequently unlocked.
LOCK ASSOCIATED
MSB REGISTERS
Figure 55. Phase 1 of 10-Bit Read
FIRST READ
COMMAND
LSB
REGISTER
OUTPUT
DATA
0
UNLOCK ASSOCIATED
MSB REGISTERS
Figure 56. Phase 2 of 10-Bit Read
SECOND READ
COMMAND
MSB
REGISTER
OUTPUT
DATA
0
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
register first does not lock other MSB registers, and likewise
reading an LSB register first does not lock other LSB registers.
Table 10. ADT7516/ADT7517/ADT7519 Registers
RD/WR
Address
00h
Interrupt Status 1
01h
Interrupt Status 2
02h
Reserved
03h
Internal Temp and V
DD
LSBs
04h
External Temp and AIN1 to
AIN4 LSBs
05h
Reserved
06h
V
DD
MSBs
07h
Internal Temp MSBs
08h
External Temp MSBs/AIN1
MSBs
09h
AIN2 MSBs
0Ah
AIN3 MSBs
0Bh
AIN4 MSBs
0Ch–0Fh
Reserved
10h
DAC A LSBs
(ADT7516/ADT7517 only)
11h
DAC A MSBs
12h
DAC B LSBs
(ADT7516/ADT7517 only)
13h
DAC B MSBs
14h
DAC C LSBs
(ADT7516/ADT7517 only)
Name
Power-On
Default
00h
00h
00h
00h
00h
xxh
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
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