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參數(shù)資料
| 型號： | TCN75-5.0MPA |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR |
| 中文描述： | 2線串行溫度傳感器和溫度監(jiān)測 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大小： | 259K |
| 代理商： | TCN75-5.0MPA |
3
TCN75
PRELIMINARY INFORMATION
2-WIRE SERIAL TEMPERATURE
SENSOR AND THERMAL MONITOR
TCN75-04 6/16/97
SERIAL PORT TIMING
(Cont.):
2.7V
≤
V
DD
≤
5.5V; – 55
°
C
≤
(T
A
= T
J
)
≤
125
°
C, C
L
= 80pf, unless otherwise
noted.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
t
H(START)
t
DSU
t
DH
t
SU(STOP)
t
IDLE
Start Condition Hold Time
Data in Setup Time to SCL High
Data in Hold Time after SCL Low
Stop Condition Setup Time
Bus Free Time Prior to New
Transition
NOTES:
1. Output current should be minimized for best temperature accuracy. Power dissipation within the TCN75 will cause self-heating and
temperature drift. At maximum rated output current and saturation voltage, 4mA and 0.8V, respectively, the error amounts to 0.352
°
C for the
PDIP, and 0.544
°
C for the SOIC.
2. All part types of the TCN75 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified
for rated accuracy at its nominal supply voltage. As V
DD
varies from the nominal value, accuracy will degrade 1
°
C/V of V
DD
change.
3. Human body model, 100pF discharged through a 1.5k resistor, machine model, 200pF discharged directly into each pin.
1250
100
0
1250
1250
—
—
—
—
—
—
—
—
—
—
nsec
nsec
nsec
nsec
nsec
PIN DESCRIPTION
Pin Number
Symbol
Description
1
2
3
4
5
6
7
8
SDA
SCL
Bidirectional Serial Data.
Serial Data Clock Input.
Interrupt or Comparator Output.
System Ground.
Address Select Pin (MSB).
Address Select Pin.
Address Select Pin (LSB).
Power Supply Input.
INT/CMPTR
GND
A
2
A
1
A
0
V
DD
DETAILED DESCRIPTION
A typical TCN75 hardware connection is shown in
Figure 1.
Serial Data (SDA)
Bidirectional. Serial data is transferred in both directions
using this pin.
Serial Clock (SCL)
Input. Clocks data into and out of the TCN75.
INT/CMPTR
Open Collector, Programmable Polarity. In Comparator
Mode, unconditionally driven active any time temperature
exceeds the value programmed into the T
SET
register. INT/
CMPTR will become inactive when temperature subse-
quently falls below the T
HYST
setting. (See Register Set and
Programmer's Model.) In Interrupt Mode, INT/CMPTR is
also made active by TEMP exceeding T
SET
; it is uncondition-
ally reset to its inactive state by reading any register via the
2-wire bus. If and when temperature falls below T
HYST
, INT/
CMPTR is again driven active. Reading any register will
clear the T
HYST
interrupt. In Interrupt Mode, the INT/CMPTR
output is unconditionally reset upon entering Shutdown
Mode. If programmed as an active-low output, it can be
wire-ORed with any number of other open collector devices.
Most systems will require a pull-up resistor for this configu-
ration.
Note that current sourced from the pull-up resistor
causes power dissipation and may cause internal heating of
the TCN75. To avoid affecting the accuracy of ambient
temperature readings, the pull-up resistor should be made
as large as possible. INT/CMPTR's output polarity may be
programmed by writing to the INT/CMPTR POLARITY bit in
the CONFIG register. The default is active low.
Address (A2, A1, A0)
Inputs. Sets the three least significant bits of the TCN75
8-bit address. A match between the TCN75's address and
the address specified in the serial bit stream must be made
to initiate communication with the TCN75. Many protocol-
compatible devices with other addresses may share the
same 2-wire bus.
Slave Address
The four most significant bits of the Address Byte (A6,
A5, A4, A3) are fixed to 1001[B]. The states of A2, A1 and
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