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參數(shù)資料
| 型號： | x9252 |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Quad Digitally-Controlled (XDCP TM) Potentiometer(低功耗、四路256抽頭、2線總線、上升/下降接口) |
| 中文描述： | 四數(shù)字控制（數(shù)字電位器商標(biāo)）電位（低功耗，四路256抽頭，2線總線，上升/下降接口） |
| 文件頁數(shù)： | 8/21頁 |
| 文件大?。?/td> | 125K |
| 代理商： | X9252 |
8 of 21
REV 1.4.1 7/29/03
www.xicor.com
X9252
HIGH-VOLTAGE WRITE CYCLE TIMING
XDCP 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.
Symbol
t
WC
(8)(5)
Parameter
Typ.
5
Max.
10
Units
ms
Non-volatile write cycle time
Symbol
t
WRL
(5)
Parameter
Min.
5
Max.
20
Units
μs
SCL rising edge to wiper code changed, wiper response time after
instruction issued (all load instructions)
Test Circuit
Equivalent Circuit
Force
Current
Test Point
R
W
C
H
C
L
R
W
R
TOTAL
C
W
R
H
R
L
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