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參數(shù)資料
| 型號： | X9241AWVIZT1 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 0K |
| 描述： | IC XDCP QUAD 4X10K EE 20-TSSOP |
| 標準包裝： | 2,500 |
| 系列： | XDCP™ |
| 接片： | 64 |
| 電阻（歐姆）： | 10k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標準值 ±300 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | I²C（設備位址） |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 20-TSSOP |
| 包裝： | 帶卷 (TR) |
5
FN8164.6
August 31, 2007
Flow 1. ACK Polling Sequence
Instruction Structure
The next byte sent to the X9241A contains the instruction
and register pointer information. The 4 most significant bits
are the instruction. The next 4-bits point to one of four pots
and when applicable they point to one of four associated
registers. The format is in Figure 2.
The 4 high order bits define the instruction. The next 2-bits
(P1 and P0) select which one of the four potentiometers is to
be affected by the instruction. The last 2-bits (R1 and R0)
select one of the four registers that are to be acted upon
when a register oriented instruction is issued.
Four of the nine instructions end with the transmission of the
instruction byte. The basic sequence is illustrated in Figure 3.
These two-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. The response
of the wiper to this action will be delayed tSTPWV. A transfer
from WCR current wiper position to a Data Register is a write
to nonvolatile memory and takes a minimum of tWR to
complete. The transfer can occur between one of the four
potentiometers and one of its associated registers; or it may
occur globally, wherein the transfer occurs between all four of
the potentiometers and one of their associated registers.
Four instructions require a three-byte sequence to complete.
These instructions transfer data between the host and the
X9241A; either between the host and one of the Data
Registers or directly between the host and the WCR. These
instructions are: Read WCR, read the current wiper position
of the selected pot; Write WCR, change current wiper
position of the selected pot; Read Data Register, read the
contents of the selected nonvolatile register; Write Data
Register, write a new value to the selected Data Register.
The sequence of operations is shown in Figure 4.
The Increment/Decrement command is different from the
other commands. Once the command is issued and the
X9241A 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 (tHIGH) while SDA is HIGH, the
selected wiper will move one resistor segment towards the
VH/RH terminal. Similarly, for each SCL clock pulse while
SDA is LOW, the selected wiper will move one resistor
segment towards the VL/RL terminal. A detailed illustration
of the sequence and timing for this operation is shown in
NONVOLATILE WRITE
COMMAND COMPLETED
ENTER ACK POLLING
ISSUE
START
ISSUE SLAVE
ADDRESS
ACK
RETURNED?
FURTHER
OPERATION?
ISSUE
INSTRUCTION
PROCEED
ISSUE STOP
NO
YES
PROCEED
ISSUE STOP
NO
I1
I2
I3
I0
P1
P0
R1
R0
POTENTIOMETER
SELECT
REGISTER
SELECT
INSTRUCTIONS
FIGURE 2. INSTRUCTION BYTE FORMAT
S
T
A
R
T
0101
A3
A2
A1
A0
A
I3
I2
I1
I0
P1
P0
R1
R0
SCL
SDA
S
T
O
P
C
K
A
C
K
FIGURE 3. TWO-BYTE INSTRUCTION SEQUENCE
X9241A
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