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參數(shù)資料
| 型號(hào)： | ISL90727UIE6Z |
| 廠商： | INTERSIL CORP |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Digitally Controlled Potentiometer (XDCP) |
| 中文描述： | 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 128 POSITIONS, PDSO6 |
| 封裝： | LEAD FREE, MO-203-AB, SC-70, 6 PIN |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 227K |
| 代理商： | ISL90727UIE6Z |
6
FN8247.1
August 1, 2005
The WR and IVR can be read or written directly using the
I
2
C serial interface as described in the following sections.
I
2
C Serial Interface
The ISL90727 supports bidirectional bus oriented protocol.
The protocol defines any device that sends data onto the
bus as a transmitter and the receiving device as the receiver.
The device controlling the transfer is a master and the
device being controlled is the slave. The master always
initiates data transfers and provides the clock for both
transmit and receive operations. Therefore, the ISL90727
operates as slave device in all applications.
All communication over the I
2
C interface is conducted by
sending the MSB of each byte of data first.
Protocol Conventions
Data states on the SDA line can change only during SCL
LOW periods. SDA state changes during SCL HIGH are
reserved for indicating START and STOP conditions (See
Figure 1). On power-up of the ISL90727, the SDA pin is in
the input mode.
All I
2
C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH. The ISL90727 continuously monitors the SDA
and SCL lines for the START condition and does not
respond to any command until this condition is met (See
Figure 1). A START condition is ignored during the power-up
sequence and during internal non-volatile write cycles.
All I
2
C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
SCL is HIGH (See Figure 1).
An ACK, Acknowledge, is a software convention used to
indicate a successful data transfer. The transmitting device,
either master or slave, releases the SDA bus after
transmitting eight bits. During the ninth clock cycle, the
receiver pulls the SDA line LOW to acknowledge the
reception of the eight bits of data (See Figure 2).
The ISL90727 responds with an ACK after recognition of a
START condition followed by a valid Identification Byte, and
once again after successful receipt of an Address Byte. The
ISL90727 also responds with an ACK after receiving a Data
Byte of a write operation. The master must respond with an
ACK after receiving a Data Byte of a read operation.
A valid Identification Byte contains 0101000 as the seven
MSBs. The LSB in the Read/Write bit. Its value is “1” for a
Read operation, and “0” for a Write operation (See Table 1).
Write Operation
A Write operation requires a START condition, followed by a
valid Identification Byte, a valid Address Byte, a Data Byte,
and a STOP condition. After each of the three bytes, the
ISL90727 responds with an ACK. At this time, the device
enters its standby state (See Figure 3).
Data Protection
A valid Identification Byte, Address Byte, and total number of
SCL pulses act as a protection of both volatile and non-
volatile registers. During a Write sequence, the Data Byte is
loaded into an internal shift register as it is received. If the
Address Byte is 0, the Data Byte is transferred to the Wiper
Register (WR) at the falling edge of the SCL pulse that loads
the last bit (LSB) of the Data Byte. If an address other than
00h or an invalid slave address is sent, then the device will
respond with no ACK.
Read Operation
A Read operation consist of a three byte instruction followed
by one or more Data Bytes (See Figure 4). The master
initiates the operation issuing the following sequence: a
START, the Identification byte with the R/W bit set to “0”, an
Address Byte, a second START, and a second Identification
byte with the R/W bit set to “1”. After each of the three bytes,
the ISL90727 responds with an ACK. Then the ISL90727
transmits the Data Byte as long as the master responds with
an ACK during the SCL cycle following the eighth bit of each
byte. The master then terminates the read operation (issuing
a STOP condition) following the last bit of the Data Byte (See
Figure 4).
TABLE 1. IDENTIFICATION BYTE FORMAT
0
1
0
1
0
0
0
R/W
(MSB)
(LSB)
SDA
SCL
START
DATA
STABLE
DATA
CHANGE
STOP
DATA
STABLE
FIGURE 1. VALID DATA CHANGES, START, AND STOP CONDITIONS
ISL90727
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL90727UIE6Z-TK | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Digitally Controlled Potentiometer (XDCP) |
| ISL90727WIE627Z | 功能描述:IC XDCP 128-TAP 10KOHM SC70-6 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 標(biāo)準(zhǔn)包裝:2,500 系列:XDCP™ 接片:256 電阻（歐姆）:100k 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:2.7 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:帶卷 (TR) |
| ISL90727WIE627ZS2568 | 制造商:Intersil Corporation 功能描述:- Bulk |
| ISL90727WIE627Z-T7A | 功能描述:IC POT DGTL 128POS 10K SC70-6 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 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:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| ISL90727WIE627Z-TK | 功能描述:數(shù)字電位計(jì) IC ISL90727 IND 6LD SC7 SNGVOLATILE 128 TAP RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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