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參數資料
| 型號： | TCM1617 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | SMBus Thermal Sensor with External Diode Input |
| 中文描述： | 的SMBus溫度傳感器與外部二極管輸入 |
| 文件頁數： | 5/14頁 |
| 文件大?。?/td> | 74K |
| 代理商： | TCM1617 |
5
TCM1617
TCM1617-1 2/5/99
2001 Microchip Technology Inc. DS21485A
SMBus Thermal Sensor with External Diode Input
PIN DESCRIPTION
Pin Number
Symbol
Type
Description
2
3
4
V
DD
D+
D–
Power
Power Supply Input
Current Source and A/D Positive Input
Current Sink and A/D Negative Input
Address Select Pins (See Address Decode Table)
System Ground
SMBus Interrupt (SMBALERT#)
SMBus Serial Data
SMBus Serial Clock
Standby Enable
Not Connected
Bi-Directional
Bi-Directional
Input
Power
Output
Bi-Directional
Input
Input
—
6,10
7,8
11
12
14
15
ADD[1:0]
GND
ALERT#
SDA
SCL
STBY#
NC
1,5, 9, 13,16
PIN DESCRIPTION
SCL
Input. SMBus serial clock. Clocks data into and out of
the TCM1617. See System Management Bus Specification,
rev. 1.0, for timing diagrams.
SDA
Bi-directional. Serial data is transferred on the SMBus
in both directions using this pin. See System Management
Bus Specification, rev. 1.0, for timing diagrams.
ADD1, ADD0
Inputs.
Sets the 7-bit SMBus address. These pins are
“tri-state,” and the SMBus addresses are specified in the
Address Decode Table below.
(
NOTE:
The tri-state scheme allows up to nine
TCM1617s on a single bus. A match between the TCM1617’s
address and the address specified in the serial bit stream
must be made to initiate communication. Many SMBus-
compatible devices with other addresses may share the
same 2-wire bus (see System Management Bus Specifica-
tion rev. 1.0 for address allocations). These pins are only
active at power-on reset, and will latch into the appropriate
states.
ALERT#
Output, Open Collector, Active Low. The ALERT# out-
put corresponds to the general SMBALERT# signal and
indicates an interrupt event. The TCM1617 will respond to
the standard SMBus Alert Response Address (see SMBus
Specification 1.0) and associated protocol when ALERT# is
asserted. Normally, the ALERT# output will be asserted
when any of the following occurs:
INT_TEMP equal to or exceeds INT_HLIM
INT_TEMP falls below INT_LLIM
EXT_TEMP equal to or exceeds EXT_HLIM
EXT_TEMP falls below EXT_LLIM
External Diode “Open”
The operation of the ALERT# output is controlled by the
MASK1 bit in the CONFIG register. If the MASK1 bit is set to
“1,” no interrupts will be generated on ALERT#. The ALERT#
output is cleared and re-armed by the Alert Response
Address (ARA). This output may be WIRE-ORed with simi-
lar outputs from other SMBus devices. If the alarm condition
persists after the ARA, the ALERT# output will be immedi-
ately re-asserted.
(
NOTE:
A pull-up resistor is necessary on ALERT#
since it is an open-drain output. Current sourced from the
pull-up resistor causes power dissipation and may cause
internal heating of the TCM1617. To avoid affecting the
accuracy of internal temperature readings, the pull-up resis-
tors should be made as large as possible.)
STBY#
Input. The activation of Standby mode may be achieved
using either the STBY# pin or the CHIP STOP bit (CONFIG
register). If STBY# is pulled low, the TCM1617 uncondition-
ally enters its low-power Standby mode (I
DD
= 10
μ
A, max).
The temperature-to-digital conversion process is halted, but
ALERT remains functional. The TCM1617’s bus interface
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