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參數(shù)資料
| 型號(hào)： | X9269 |
| 廠商： | Intersil Corporation |
| 英文描述： | 3A,400V,SILASTIC RECT. |
| 中文描述： | 單電源/低Power/256-Tap/2-Wire巴士 |
| 文件頁數(shù)： | 10/25頁 |
| 文件大?。?/td> | 422K |
| 代理商： | X9269 |
X9269
REV 1.1.11 2/17/03
Characteristics subject to change without notice.
10 of 25
www.xicor.com
DEVICE DESCRIPTION
Instructions
Four of the nine instructions are three bytes in length.
These instructions are:
–
Read Wiper Counter Register
– read the current
wiper position of the selected potentiometer,
–
Write Wiper Counter Register
– change current
wiper position of the selected potentiometer,
–
Read Data Register
– read the contents of the
selected Data Register;
–
Write Data Register
– write a new value to the
selected Data Register.
The basic sequence of the three byte instructions is
illustrated in Figure 4. These three-byte instructions
exchange data between the WCR and one of the Data
Registers. A transfer from a Data Register to a WCR is
essentially a write to a static RAM, with the static RAM
controlling the wiper position. The response of the
wiper to this action will be delayed by t
WRL
. A transfer
from the WCR (current wiper position), to a Data
Register is a write to nonvolatile memory and takes a
minimum of t
WR
to complete. The transfer can occur
between one of the four potentiometers and one of its
associated registers; or it may occur globally, where the
transfer occurs between all potentiometers and one
associated register
Four instructions require a two-byte sequence to
complete. These instructions transfer data between the
host and the X9269; either between the host and one of
the data registers or directly between the host and the
Wiper Counter Register. These instructions are:
–
XFR Data Register to Wiper Counter Register
–
This transfers the contents of one specified Data
Register to the associated Wiper Counter Register.
–
XFR Wiper Counter Register to Data Register
–
This transfers the contents of the specified Wiper
Counter Register to the specified associated Data
Register.
–
Global XFR Data Register to Wiper Counter
Register
– This transfers the contents of all specified
Data Registers to the associated Wiper Counter Reg-
isters.
–
Global XFR Wiper Counter Register to Data
Register
– This transfers the contents of all Wiper
Counter Registers to the specified associated Data
Registers.
INCREMENT/DECREMENT COMMAND
The final command is Increment/Decrement (Figure 5
and 6). The Increment/Decrement command is different
from the other commands. Once the command is
issued and the X9269 has responded with an
acknowledge, the master can clock the selected wiper
up and/or down in one segment steps; thereby,
providing a fine tuning capability to the host. For each
SCL clock pulse (t
HIGH
) while SDA is HIGH, the
selected wiper will move one resistor segment towards
the R
H
terminal. Similarly, for each SCL clock pulse
while SDA is LOW, the selected wiper will move one
resistor segment towards the R
L
terminal.
See Instruction format for more details.
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|---|---|
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