參數(shù)資料
型號(hào): DS1775
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 溫度/濕度傳感器
英文描述: SOT23 Digital Thermometer and Thermostat(SOT23數(shù)字溫度計(jì)和恒溫控制器)
中文描述: DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), RECTANGULAR, SURFACE MOUNT
封裝: SOT-23, 5 PIN
文件頁數(shù): 12/13頁
文件大小: 307K
代理商: DS1775
DS1775
12 of 13
AC ELECTRICAL CHARACTERISTICS:
2–WIRE INTERFACE
PARAMETER
SCL clock frequency
(–55
°
C to +125
°
C; V
DD
=2.7V to 5.5V)
CONDITION
MIN
TYP
Fast Mode
Standard Mode
Fast Mode
Standard Mode
4.7
SYMBOL
f
SCL
MAX
400
100
UNITS
KHZ
NOTES
Bus free time between a
STOP and START
condition
Hold time (repeated)
START condition
LOW period of SCL
t
BUF
1.3
μ
s
t
HD:STA
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
0.6
4.0
1.3
4.7
0.6
4.0
0.6
4.7
0
0
100
250
20+
0.1C
B
20+
0.1C
B
0.6
4.0
μ
s
5
t
LOW
μ
s
HIGH period of SCL
t
HIGH
μ
s
Set-up time for a
repeated START
Data hold time
t
SU:STA
μ
s
t
HD:DAT
0.9
0.9
μ
s
6
Data set-up time
t
SU:DAT
ns
7
Rise time of both SDA and
SCL signals
Fall time of both SDA and
SCL signals
Set-up time for STOP
t
R
300
1000
300
300
ns
8
t
F
ns
8
t
SU:STO
μ
s
Capacitive load for each bus
line
Input Capacitance
C
b
400
pF
8
C
I
5
pF
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 V
DD
is switched off.
3.
I
DD
specified with O.S. pin open.
4.
I
DD
specified with V
DD
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 t
HD:DAT
has only to be met if the device does not stretch the LOW period (t
LOW
) of the
SCL signal.
7.
A fast mode device can be used in a standard mode system, but the requirement t
SU: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 t
R MAX
+t
SU:DAT
= 1000+250 = 1250 ns before the SCL line is released.
8.
C
b
– total capacitance of one bus line in pF.
9.
Internal heating caused by O.S. loading will cause the DS1775 to read approximately 0.5oC 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.
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