參數(shù)資料
型號: DS2890X
元件分類: 數(shù)字電位計
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): 18/27頁
文件大?。?/td> 939K
代理商: DS2890X
DS2890
18 of 27
Figure 14.
INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES”
RESISTOR
MASTER
DS2890
MASTER RX "PRESENCE PULSE"
REGULAR SPEED
480 μs
t
RSTL
<
*
480 μs
t
RSTH
<
**
15 μs
t
PDH
< 60 μs
60
t
PDL
< 240 μs
OVERDRIVE SPEED
48 μs
t
RSTL
< 80 μs
48 μs
t
RSTH
<
**
2 μs
t
PDH
< 6 μs
8
t
PDL
< 24 μs
MASTER TX
"RESET PULSE"
V
PULLUP
V
PULLUP MIN
V
IH MIN
V
IL MAX
0V
t
RSTH
t
RSTL
t
PDH
t
PDL
t
R
* In order not to mask interrupt signaling by other devices on the 1-Wire bus and to prevent a power-
on reset of the parasite powered circuit, t
RSTL
+ t
R
should always be less than 960 μs.
** Includes recovery time.
Figure 15.
READ/WRITE TIMING DIAGRAMS
a) Write-one Time Slot
15μs
(OD: 2μs)
60μs
(OD: 6μs)
DS2890
Sampling Window
V
PULLUP
V
PULLUP MIN
V
IH MIN
V
IL MAX
0V
t
SLOT
t
REC
t
LOW1
REGULAR SPEED
60 μs
t
SLOT
< 120 μs
1 μs
t
LOW1
< 15 μs
1 μs
t
REC
<
OVERDRIVE SPEED
6 μs
t
SLOT
< 16 μs
1 μs
t
LOW1
< 2 μs
1 μs
t
REC
<
RESISTOR
MASTER
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