參數(shù)資料
型號(hào)： DS1775R/TR1
廠(chǎng)商： DALLAS SEMICONDUCTOR
元件分類(lèi)： Switch/Digital Output Temperature Sensor
英文描述： DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT
封裝： SOT-23, 5 PIN
文件頁(yè)數(shù)： 4/13頁(yè)
文件大小： 201K
代理商： DS1775R/TR1
DS1775
12 of 13
AC ELECTRICAL CHARACTERISTICS:
2–WIRE INTERFACE
(–55C to +125C; VDD =2.7V to 5.5V)
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
NOTES
SCL clock frequency
fSCL
Fast Mode
Standard Mode
400
100
kHz
Bus free time between a
STOP and START
condition
tBUF
Fast Mode
Standard Mode
1.3
4.7
s
Hold time (repeated)
START condition
tHD:STA
Fast Mode
Standard Mode
0.6
4.0
s
5
LOW period of SCL
tLOW
Fast Mode
Standard Mode
1.3
4.7
s
HIGH period of SCL
tHIGH
Fast Mode
Standard Mode
0.6
4.0
s
Set-up time for a
repeated START
tSU:STA
Fast Mode
Standard Mode
0.6
4.7
s
Data hold time
tHD:DAT
Fast Mode
Standard Mode
0
0.9
s
6
Data set-up time
tSU:DAT
Fast Mode
Standard Mode
100
250
ns
7
Rise time of both SDA and
SCL signals
tR
Fast Mode
Standard Mode
20+
0.1CB
300
1000
ns
8
Fall time of both SDA and
SCL signals
tF
Fast Mode
Standard Mode
20+
0.1CB
300
ns
8
Set-up time for STOP
tSU:STO
Fast Mode
Standard Mode
0.6
4.0
s
Capacitive load for each
bus line
Cb
400
pF
8
Input Capacitance
CI
5pF
NOTES:
1. All voltages are referenced to ground.
2. I/O pins of fast mode devices must not obstruct the SDA and SCL lines if VDD is switched off.
3. IDD specified with O.S. pin open.
4. IDD specified with VCC at 5.0V and SDA, SCL = 5.0V, 0
°C to +70°C.
5. After this period, the first clock pulse is generated.
6. The maximum tHD: DAT has only to be met if the device does not stretch the LOW period (tLOW) of the
SCL signal.
7. A fast mode device can be used in a standard mode system, but the requirement tSU: DAT
≥ 250 ns must
then be met. This will automatically be the case if the device does not stretch the LOW period of the
SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data
bit to the SDA line tR MAX +tSU: DAT = 1000+250 = 1250 ns before the SCL line is released.
8. Cb – total capacitance of one bus line in pF.
9. Internal heating caused by O.S. loading will cause the DS1775 to read approximately 0.5C higher if
O.S. is sinking the max rated current.
10. Contact the factory in Dallas, (972) 371-4448, for operation requiring temperature readings greater
than 120°C.
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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