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參數資料
| 型號： | KSZ9021RN-EVAL |
| 廠商： | Micrel Inc |
| 文件頁數： | 35/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR KSZ9021RN |
| 標準包裝： | 1 |
| 主要目的： | 接口，以太網控制器（PHY 和 MAC） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | KSZ9021RN |
| 已供物品： | 板 |
| 相關產品： | 576-3978-ND - IC TXRX 10/100/1000 SGL 48QFN 576-3637-ND - IC TXRX 10/100/1000 SGL 48QFN |
| 其它名稱： | 576-3874 |
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MCP444X/446X
DS22265A-page 40
2010 Microchip Technology Inc.
3.1
High Voltage Command /
Address 0 (HVC/A0)
The HVC/A0 pin is the Address 0 input for the I2C
interface as well as the High Voltage Command pin. At
the device’s POR/BOR the value of the A0 address bit
is latched. This input along with the A1 pin completes
the device address. This allows up to 4 MCP44XX
devices to be on a single I2C bus.
During normal operation, the voltage on this pin
determines whether the I2C command is a normal
command or a High Voltage command (when HVC/A0
= VIHH).
3.2
Serial Clock (SCL)
The SCL pin is the serial interfaces Serial Clock pin.
This pin is connected to the Host Controllers SCL pin.
The MCP44XX is a slave device, so its SCL pin accepts
only external clock signals.
3.3
Serial Data (SDA)
The SDA pin is the serial interfaces Serial Data pin.
This pin is connected to the Host Controllers SDA pin.
The SDA pin is an open-drain N-channel driver.
3.4
Ground (VSS)
The VSS pin is the device ground reference.
3.5
Potentiometer Terminal B
The terminal B pin is connected to the internal
potentiometer’s terminal B.
The potentiometer’s terminal B is the fixed connection
to the Zero Scale wiper value of the digital
potentiometer. This corresponds to a wiper value of
0x00 for both 7-bit and 8-bit devices.
The terminal B pin does not have a polarity relative to
the terminal W or A pins. The terminal B pin can
support both positive and negative current. The voltage
on terminal B must be between VSS and VDD.
MCP44XX devices have four terminal B pins, one for
each resistor network.
3.6
Potentiometer Wiper (W) Terminal
The terminal W pin is connected to the internal
potentiometer’s terminal W (the wiper). The wiper
terminal is the adjustable terminal of the digital
potentiometer. The terminal W pin does not have a
polarity relative to terminals A or B pins. The terminal
W pin can support both positive and negative current.
The voltage on terminal W must be between VSS and
VDD.
MCP44XX devices have four terminal W pins, one for
each resistor network.
3.7
Potentiometer Terminal A
The terminal A pin is available on the MCP44X1
devices,
and
is
connected
to
the
internal
potentiometer’s terminal A.
The potentiometer’s terminal A is the fixed connection
to the Full Scale wiper value of the digital
potentiometer. This corresponds to a wiper value of
0x100 for 8-bit devices or 0x80 for 7-bit devices.
The terminal A pin does not have a polarity relative to
the terminal W or B pins. The terminal A pin can
support both positive and negative current. The voltage
on terminal A must be between VSS and VDD.
The terminal A pin is not available on the MCP44X2
devices, and the internally terminal A signal is floating.
MCP44X1 devices have four terminal A pins, one for
each resistor network. Terminal A is not available on
the MCP44X2 devices.
3.8
Write Protect (WP)
The WP pin is used to force the nonvolatile memory to
be write protected.
3.9
Reset (RESET)
The RESET pin is used to force the device into the
POR/BOR state.
3.10
Address 1 (A1)
The A1 pin is the I2C interface’s Address 1 pin. Along
with the A0 pins, up to 4 MCP44XX devices can be on
a single I2C bus.
3.11
Positive Power Supply Input (VDD)
The VDD pin is the device’s positive power supply input.
The input power supply is relative to VSS.
While the device VDD < Vmin (2.7V), the electrical
performance of the device may not meet the data sheet
specifications.
3.12
No Connect (NC)
These pins should be either connected to VDD or VSS.
3.13
Exposed Pad (EP)
This pad is conductively connected to the device's
substrate. This pad should be tied to the same potential
as the VSS pin (or left unconnected). This pad could be
used to assist as a heat sink for the device when
connected to a PCB heat sink.
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