參數(shù)資料
型號: X9251TS24ZT1
廠商: Intersil
文件頁數(shù): 17/20頁
文件大小: 0K
描述: IC XDCP QUAD 256TAP 100K 24-SOIC
產(chǎn)品培訓(xùn)模塊: Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝: 1,000
系列: XDCP™
接片: 256
電阻(歐姆): 100k
電路數(shù): 4
溫度系數(shù): 標(biāo)準(zhǔn)值 ±300 ppm/°C
存儲(chǔ)器類型: 非易失
接口: 6 線 SPI(芯片選擇,設(shè)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: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC
包裝: 帶卷 (TR)
6
FN8166.5
April 13, 2007
Serial Interface
The X9251 supports the SPI interface hardware conventions.
The device is accessed via the SI input with data clocked in,
on the rising SCK. CS must be LOW and the HOLD and WP
pins must be HIGH during the entire operation.
The SO and SI pins can be connected together, since they
have three state outputs. This can help to reduce system pin
count.
Identification Byte
The first byte sent to the X9251 from the host, following a CS
going HIGH to LOW, is called the Identification Byte. The
most significant four bits of the Identification Byte are a
Device Type Identifier, ID[3:0]. For the X9251, this is fixed as
0101 (refer to Table 3).
The least significant four bits of the Identification Byte are the
Slave Address bits, AD[3:0]. For the X9251, A3 is 0, A2 is 0,
A1 is the logic value at the input pin A1, and A0 is the logic
value at the input pin A0. Only the device which Slave
Address matches the incoming bits sent by the master
executes the instruction. The A1 and A0 inputs can be actively
driven by CMOS input signals or tied to VCC or VSS.
Instruction Byte
The next byte sent to the X9251 contains the instruction and
register pointer information. The four most significant bits are
used provide the instruction opcode (I[3:0]). The RB and RA
bits point to one of the four Data Registers of each associated
XDCP. The least two significant bits point to one of four Wiper
Counter Registers or DCPs.The format is shown below in
Table 4.
TABLE 3. IDENTIFICATION BYTE FORMAT
TABLE 4. INSTRUCTION BYTE FORMAT
TABLE 1. WIPER COUNTER REGISTER, WCR (8-bit), WCR[7:0]: USED TO STORE THE CURRENT WIPER POSITION (VOLATILE)
WCR7
WCR6
WCR5
WCR4
WCR3
WCR2
WCR1
WCR0
(MSB)
(LSB)
TABLE 2. DATA REGISTER, DR (8-bit), DR[7:0]: USED TO STORE WIPER POSITIONS OR DATA (NON-VOLATILE)
Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
(MSB)
(LSB)
ID3
ID2
ID1
ID0
A3
A2
A1
A0
01
0100
Pin A1
Logic Value
Pin A0
Logic Value
(MSB)
(LSB)
Device Type
Identifier
Slave Address
I3
I2
I1
I0
RB
RA
P1
P0
(MSB)
(LSB)
Instruction
Register
DCP Selection
Opcode
Selection
(WCR Selection)
Data Register Selection
REGISTER
RB
RA
DR#0
0
DR#1
0
1
DR#2
1
0
DR#3
1
#: 0, 1, 2, or 3
X9251
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