參數(shù)資料
型號: DS2890T-000
英文描述: 128 x 128 pixel format, LED or EL Backlight available
中文描述: 1 - Wire數(shù)字電位器
文件頁數(shù): 26/27頁
文件大?。?/td> 939K
代理商: DS2890T-000
DS2890
26 of 27
AC ELECTRICAL CHARACTERISTICS - REGULAR 1-WIRE SPEED
2.8V
V
PUP
6.0V, -40
°
C
T
A
+85
°
C
MIN
TYP
MAX
PARAMETER
SYMBOL
UNITS
NOTES
Time Slot
t
SLOT
60
120
μs
Write 1 Low Time
t
LOW1
t
LOW0
t
LOWR
t
RDV
t
RELEASE
t
SU
t
REC
1
15
μs
Write 0 Low Time
60
120
μs
Read Low Time
1
15
μs
Read Data Valid
15
μs
1
Release Time
0
15
45
μs
Read Data Setup
1
μs
2
Recovery Time
1
μs
Reset High Time
t
RSTH
t
RSTL
t
PDH
t
PDL
480
μs
3
Reset Low Time
480
μs
4
Presence Detect High
15
60
μs
Presence Detect Low
60
240
μs
NOTES:
1.
The optimal sampling point for the master is as close as possible to the end time of the 15
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.
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
Time Slot
t
SLOT
6
16
μs
Write 1 Low Time
t
LOW1
t
LOW0
t
LOWR
t
RDV
t
RELEASE
t
SU
1
2
μs
Write 0 Low Time
6
16
μs
Read Low Time
1
2
μs
Read Data Valid
2
μs
9
Release Time
0
1.5
4
μs
Read Data Setup
1
μs
4
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