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參數(shù)資料
| 型號： | X9455UV24-2.7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Dual Two-wiper Digitally-Controlled (XDCP) Potentiometer |
| 中文描述： | DUAL 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 372K |
| 代理商： | X9455UV24-2.7 |
6
FN8202.0
November 10, 2004
Increment/Decrement Timing
NOTES:
1. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = [V(R
W(n)(actual)
)-V(R
W(n)(expected)
)]/MI
V(R
W(n)(expected)
) = n(V(R
H
)-V(R
L
))/255 + V(R
L
), with n from 0 to 255.
2. Relative linearity is a measure of the error in step size between taps = [V(R
W(n+1)
)-(V(R
W(n)
) + MI)]/MI, with n from 0 to 254
3. 1 Ml = Minimum Increment = [V(R
H
)-V(R
L
)]/255.
4. Typical values are for T
A
= 25°C and nominal supply voltage.
5. This parameter is not 100% tested.
6. Ratiometric temperature coefficient = (V(R
W
)
T1(n)
-V(R
W
)
T2(n)
)/[V(R
W
)
T1(n)
(T1-T2)] x 10
6
, with T1 & T2 being 2 temperatures, and n from 0 to
255.
7. Measured with wiper at tap position 255, R
L
grounded, using test circuit.
8. t
WC
is the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used. It is the time from a valid
STOP condition at the end of a write sequence of a 2-wire interface write operation, or from the rising edge of CS of a valid “Store” operation of
the Up/Down interface, to the end of the self-timed internal nonvolatile write cycle.
9. The recommended power up sequence is to apply V
CC
/V
SS
first, then the potentiometer voltages. During power up, the data sheet parameters
for the DCP do not fully apply until t
D
after V
CC
reaches its final value. In order to prevent unwanted tap position changes, or an inadvertant
store, bring the CS pin high before or concurrently with the V
CC
pin on power up.
CS
SCL
U/D
R
W
t
CI
t
IL
t
IH
t
CYC
t
ID
t
DI
t
IW
MI
(3)
t
IC
t
CPHS
t
F
t
R
10%
90%
90%
t
CPHNS
DS0, DS1
High-Voltage Write Cycle Timing
SYMBOL
PARAMETER
TYP
MAX
UNITS
t
WC
(Notes 5, 8)
Non-volatile write cycle time
5
10
ms
XDCP Timing
SYMBOL
PARAMETER
MIN
MAX
UNITS
t
WRL
(Note 5)
SCL rising edge to wiper code changed, wiper response time after instruction
issued (all load instructions)
5
20
μs
X9455
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