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參數(shù)資料
| 型號： | AMC80AIPWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO24 |
| 封裝： | GREEN, PLASTIC, TSSOP-24 |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 275K |
| 代理商： | AMC80AIPWR |
SBOS559
– MAY 2011
TEMPERATURE MEASUREMENT
The AMC80
ΔVBE-type temperature sensor, is a ΔΣ ADC that performs 9-bit or 12-bit twos complement
temperature conversions. An 8-bit comparator that compares the readings to the user-programmable hot and
overtemperature setpoints, and hysteresis values is also incorporated into the AMC80.
Temperature data can be read from the Temperature Reading Register (address 27h). Temperature limits can be
read from and written to the Hot Temperature (THOT), Hot Temperature Hysteresis (THOT_HYST), OS Temperature
(TOS), and OS Temperature Hysteresis (TOS_HYST) Limit Registers (addresses 38h to 3Bh). Each limit is
represented in 12-bit, 9-bit, or 8-bit resolution, as shown in Table 2.
Table 2. Temperature Lookup
12-BIT DIGITAL OUTPUT (HEX)
9-BIT DIGITAL OUTPUT (HEX)
8-BIT DIGITAL OUTPUT (HEX)
TEMPERATURE
LSB = 0.0625
°C
LSB = 0.5
°C
LSB = 1
°C
+125
°C
07D
0FA
7D
+25
°C
019
032
19
+1
°C
010
003
01
0.0625
°C
001
—
0
°C
000
00
–0.0625°C
FFF
—
–1°C
FF0
1FF
FF
–25°C
E70
1CE
E7
–55°C
C90
192
C9
When using a single-byte read, the eight MSBs of the temperature reading can be found in the Value RAM
Register
(address
27h).
The
remainder
of
the
temperature
reading
can
be
found
in
the
OS
Configuration/Temperature Resolution Register (address 06h), bits 4 to 7. In 9-bit format, bit 7 is the only valid
bit. In addition, all nine or 12 bits can be read using a double-byte read at register address 27h.
There are four Value RAM Register limits for the temperature reading that affect the INT and OS outputs of the
AMC80. These are the THOT, THOT_HYST, TOS, TOS_HYST Limit Registers (addresses 38h to 3Bh); see Table 15.
There are three interrupt modes of operation: Default Interrupt, One-Time Interrupt, and Comparator. The OS
output of the AMC80 can be programmed for One-Time Interrupt mode and Comparator mode. INT can be
programmed for Default Interrupt mode and One-Time Interrupt mode. These modes are explained in the
following subsections.
Default Interrupt Mode
In Default Interrupt mode, exceeding THOT causes an interrupt that remains active indefinitely until reset by
reading Interrupt Status Register 1 (address 01h) or cleared by the INT_Clear bit in the Configuration Register
(address 00h, bit 3). When an interrupt event has occurred by exceeding THOT, and is then reset, another
interrupt occurs again when the next temperature conversion has completed. The interrupts continue to occur in
this manner until the temperature falls below THOT_HYST, at which time the interrupt output automatically clears.
One-Time Interrupt Mode
In One-Time Interrupt mode, exceeding THOT causes an interrupt that remains active indefinitely until reset by
reading Interrupt Status Register 1 or cleared by the INT_Clear bit in the Configuration Register. When an
interrupt event has occurred by exceeding THOT, and is then reset, an interrupt does not occur again until the
temperature falls below THOT_HYST.
Comparator Mode
In Comparator mode, exceeding TOS causes the OS output to go low (default) and remain low until the
temperature falls below TOS_HYST. When the temperature falls below TOS_HYST, OS goes high.
14
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): AMC80
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