參數(shù)資料
型號(hào)： DS2890X
元件分類： 數(shù)字電位計(jì)
英文描述： 1-Wire Digital Potentiometer
中文描述： 1 - Wire數(shù)字電位器
文件頁數(shù)： 27/27頁
文件大小： 939K
代理商： DS2890X
DS2890
27 of 27
AC ELECTRICAL CHARACTERISTICS - OVERDRIVE 1-WIRE SPEED
2.8V
≤
V
PUP
≤
6.0V, -40
°
C
≤
T
A
≤
+85
°
C
MIN
TYP
MAX
PARAMETER
SYMBOL
UNITS
NOTES
Recovery Time
t
REC
1
μs
Reset High Time
t
RSTH
t
RSTL
t
PDH
t
PDL
48
μs
Reset Low Time
48
80
μs
Presence Detect High
2
6
μs
Presence Detect Low
8
24
μs
NOTES:
1.
The optimal sampling point for the master is as close as possible to the end time of the 2
μ
s t
RDV
period without exceeding t
RDV
. For the case of a Read-one time slot, this maximizes the amount of
time for the pull-up resistor to recover the line to a high level. For a Read-zero time slot it ensures
that a read will occur before the fastest 1-Wire device(s) release the line (t
RELEASE
= 0).
2.
Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is
guaranteed to be valid within 1 μs of this falling edge.
3.
An additional reset or communication sequence cannot begin until the reset high time (t
RSTH
) has
expired.
4.
The reset low time (t
RSTL
) should be restricted to a maximum of 960 μs, to allow interrupt signaling,
otherwise, it could mask or conceal interrupt pulses.
CAPACITANCE
PARAMETER
TA = 25
°
C
UNITS
SYMBOL
MIN
TYP
MAX
NOTES
1-Wire Pin
800
pF
1
V
DD
Pin
10
pF
Resistor Terminals
10
pF
NOTE:
1.
Capacitance on the 1-Wire pin could be 800 pF when power is first applied. If a 5 k
is used to pull
up the 1-Wire line to V
PUP
, the capacitance will not affect communications after a 5
μ
s charge time.
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