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參數(shù)資料
| 型號(hào)： | ISL22319WFU8Z-TK |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 2/13頁(yè) |
| 文件大小： | 0K |
| 描述： | IC POT DGTL 128TP LN LP 8-MSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | XDCP™ |
| 接片： | 128 |
| 電阻（歐姆）： | 10k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 ±50 ppm/°C |
| 存儲(chǔ)器類(lèi)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： | -40°C ~ 125°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
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10
FN6310.1
September 9, 2009
The Access Control Register (ACR) contains information
and control bits described below in Table 2.
The VOL bit (ACR[7]) determines whether the access is to
wiper registers WR or initial value registers IVR.
If VOL bit is 0, the non-volatile IVR register is accessible. If
VOL bit is 1, only the volatile WR is accessible. Note, value
is written to IVR register also is written to the WR. The
default value of this bit is 0.
The SHDN bit (ACR[6]) disables or enables Shutdown mode.
This bit is logically ANDed with SHDN pin. When this bit is 0,
DCP is in Shutdown mode. Default value of SHDN bit is 1.
The WIP bit (ACR[5]) is read only bit. It indicates that
non-volatile write operation is in progress. It is impossible to
write to the WR or ACR while WIP bit is 1.
Shutdown Mode
The device can be put in Shutdown mode either by pulling the
SHDN pin to GND or setting the SHDN bit in the ACR register
to 0. The truth table for Shutdown mode is in Table 3.
I2C Serial Interface
The ISL22319 supports an I2C 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 ISL22319
operates as a slave device in all applications.
All communication over the I2C interface is conducted by
sending the MSB of each byte of data first.
Protocol Conventions
Data states on the SDA line must change only during SCL
LOW periods. SDA state changes during SCL HIGH are
reserved for indicating START and STOP conditions
(see Figure 12). On power-up of the ISL22319 the SDA pin
is in the input mode.
All I2C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH. The ISL22319 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 12). A START condition is ignored during the
power-up of the device.
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
SCL is HIGH (see Figure 12). A STOP condition at the end
of a read operation, or at the end of a write operation places
the device in its standby mode.
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 13).
The ISL22319 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
ISL22319 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 01010 as the five MSBs, and
the following two bits matching the logic values present at pins
A1 and A0. The LSB is the Read/Write bit. Its value is “1” for a
Read operation, and “0” for a Write operation (see Table 4).
TABLE 4. IDENTIFICATION BYTE FORMAT
TABLE 2. ACCESS CONTROL REGISTER (ACR)
VOL
SHDN
WIP
00000
TABLE 3.
SHDN pin
SHDN bit
Mode
High
1
Normal operation
Low
1
Shutdown
High
0
Shutdown
Low
0
Shutdown
01010
A1
A0
R/W
(MSB)
(LSB)
Logic values at pins A1 and A0 respectively
SDA
SCL
START
DATA
STOP
STABLE
CHANGE
DATA
STABLE
FIGURE 12. VALID DATA CHANGES, START, AND STOP CONDITIONS
ISL22319
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