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參數(shù)資料
| 型號： | ISL22319WFU8Z-TK |
| 廠商： | Intersil |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 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： | -40°C ~ 125°C |
| 安裝類型： | 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) |
9
FN6310.1
September 9, 2009
Pin Description
Potentiometers Pins
RW
RW is the wiper terminal and is equivalent to the movable
terminal of a mechanical potentiometer. The position of the
wiper within the array is determined by the WR register.
SHDN
The active low SHDN pin forces the resistor to end-to-end
open circuit condition and shorts RWi to GND. When SHDN
is returned to logic high, the previous latch settings put RW
at the same resistance setting prior to shutdown. This pin is
logically ANDed with SHDN bit in ACR register. I2C interface
is still available in shutdown mode and all registers are
accessible. This pin must remain HIGH for normal operation
(see Figure 11).
Bus Interface Pins
SERIAL DATA INPUT/OUTPUT (SDA)
The SDA is a bidirectional serial data input/output pin for I2C
interface. It receives device address, operation code, wiper
address and data from an I2C external master device at the
rising edge of the serial clock SCL, and it shifts out data after
each falling edge of the serial clock.
SDA requires an external pull-up resistor, since it is an open
drain input/output.
SERIAL CLOCK (SCL)
This is the serial clock input of the I2C serial interface. SCL
requires an external pull-up resistor, since it is an open drain
input.
DEVICE ADDRESS (A1, A0)
The address inputs are used to set the least significant 2 bits
of the 7-bit I2C interface slave address. A match in the slave
address serial data stream must match with the Address
input pins in order to initiate communication with the
ISL22319. A maximum of 4 ISL22319 devices may occupy
the I2C serial bus.
Principles of Operation
The ISL22319 is an integrated circuit incorporating one DCP
with its associated registers, non-volatile memory and an I2C
serial interface providing direct communication between a
host and the potentiometer and memory. The resistor array
is comprised of individual resistors connected in series. At
either end of the array and between each resistor is an
electronic switch that transfers the potential at that point to
the wiper.
The electronic switches on the device operate in a “make
before break” mode when the wiper changes tap positions.
When the device is powered down, the last value stored in
IVR will be maintained in the non-volatile memory. When
power is restored, the contents of the IVR is recalled and
loaded into the WR to set the wiper to the initial value.
DCP Description
The DCP is implemented with a combination of resistor
elements and CMOS switches. The physical ends of each
DCP are equivalent to the fixed terminals of a mechanical
potentiometer and internally connected to VCC and GND.
The RW pin of the DCP is connected to intermediate nodes,
and is equivalent to the wiper terminal of a mechanical
potentiometer. The position of the wiper terminal within the
DCP is controlled by an 7-bit volatile Wiper Register (WR).
When the WR of a DCP contains all zeroes (WR[6:0]= 00h),
its wiper terminal (RW) is closest to GND. When the WR
register of a DCP contains all ones (WR[6:0] = 7Fh), its wiper
terminal (RW) is closest to VCC. As the value of the WR
increases from all zeroes (0) to all ones (127 decimal), the
wiper moves monotonically from the position closest to GND
to the closest to VCC.
While the ISL22319 is being powered up, the WR is reset to
40h (64 decimal), which locates RW roughly at the center
between VCC and GND. After the power supply voltage
becomes large enough for reliable non-volatile memory
reading, the WR will be reload with the value stored in a
non-volatile Initial Value Register (IVR).
The WR and IVR can be read or written to directly using the
I2C serial interface as described in the following sections.
Memory Description
The ISL22319 contains one non-volatile 8-bit register, known as
the Initial Value Register (IVR), and two volatile 8-bit registers,
Wiper Register (WR) and Access Control Register (ACR). The
memory map of ISL22319 is on Table 1. The non-volatile
register (IVR) at address 0, contains initial wiper position and
volatile register (WR) contains current wiper position.
The non-volatile IVR and volatile WR registers are
accessible with the same address.
RW
FIGURE 11. DCP CONNECTION IN SHUTDOWN MODE
TABLE 1. MEMORY MAP
ADDRESS
NON-VOLATILE
VOLATILE
2—
ACR
1Reserved
0IVR
WR
ISL22319
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