參數(shù)資料
型號(hào)： X9429WV14Z
廠商： Intersil
文件頁(yè)數(shù)： 20/20頁(yè)
文件大?。?/td> 0K
描述： IC XDCP SGL 64-TAP 10K 14-TSSOP
標(biāo)準(zhǔn)包裝： 95
系列： XDCP™
接片： 64
電阻（歐姆）： 10k
電路數(shù)： 1
溫度系數(shù)： 標(biāo)準(zhǔn)值 ±300 ppm/°C
存儲(chǔ)器類型： 非易失
接口： I²C（設(shè)備位址）
電源電壓： 4.5 V ~ 5.5 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 14-TSSOP
包裝： 管件
9
FN8248.3
October 13, 2008
Detailed Operation
The potentiometer has a Wiper Counter Register and four
Data Registers. A detailed discussion of the register
organization and array operation follows.
Wiper Counter Register
The X9429 contains a Wiper Counter Register. The Wiper
Counter Register can be envisioned as a 6-bit parallel and
serial load counter with its outputs decoded to select one of
sixty-four switches along its resistor array. The contents of
the WCR can be altered in four ways: it may be written
directly by the host via the write Wiper Counter Register
instruction (serial load); it may be written indirectly by
transferring the contents of one of four associated Data
Registers via the XFR Data Register instruction (parallel
load); it can be modified one step at a time by the
Increment/Decrement instruction. Finally, it is loaded with the
contents of its Data Register zero (DR0) upon power-up.
The WCR is a volatile register; that is, its contents are lost
when the X9429 is powered-down. Although the register is
automatically loaded with the value in DR0 upon power-up, it
should be noted this may be different from the value present
at power-down.
Data Registers
The potentiometer has four nonvolatile Data Registers.
These can be read or written directly by the host and data
can be transferred between any of the four Data Registers
and the Wiper Counter Register. It should be noted all
operations changing data in one of these registers is a
nonvolatile operation and will take a maximum of 10ms.
If the application does not require storage of multiple
settings for the potentiometer, these registers can be used
as regular memory locations that could possibly store
system parameters or user preference data.
Register Descriptions
DATA REGISTERS, (6-BIT), NON-VOLATILE
FOUR 6-BIT DATA REGISTERS FOR EACH XDCP.
{D5~D0}: These bits are for general purpose not volatile data
storage or for storage of up to four different wiper values.
The contents of Data Register 0 are automatically moved to
the Wiper Counter Register on power-up.
WIPER COUNTER REGISTER, (6-BIT), VOLATILE
SERIAL DATA PATH
FROM INTERFACE
CIRCUITRY
REGISTER 0
REGISTER 1
REGISTER 2
REGISTER 3
SERIAL
BUS
INPUT
PARALLEL
BUS
INPUT
WIPER
COUNTER
REGISTER
INC/DEC
LOGIC
UP/DN
CLK
MODIFIED SCL
UP/DN
VH/RH
VL/RL
VW/RW
IF WCR = 00[H] THEN VW/RW = VL/RL
IF WCR = 3F[H] THEN VW/RW = VH/RH
8
6
C
O
U
N
T
E
R
D
E
C
O
D
E
(WCR)
FIGURE 8. DETAILED POTENTIOMETER BLOCK DIAGRAM
D5
D4
D3
D2
D1
D0
NV
(MSB)
(LSB)
WP5
WP4
WP3
WP2
WP1
WP0
V
VVVVV
(MSB)
(LSB)
X9429
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