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參數(shù)資料
| 型號： | KSZ9021RNI |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 36/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX 10/100/1000 SGL 48QFN |
| 標準包裝： | 260 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 8/8 |
| 規(guī)程： | 千兆位以太網(wǎng) |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 48-QFN（7x7） |
| 包裝： | 托盤 |
| 配用： | 576-3874-ND - BOARD EVALUATION FOR KSZ9021RN |
| 其它名稱： | 576-3978 KSZ9021RNI-ND |
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2010 Microchip Technology Inc.
DS22265A-page 41
MCP444X/446X
4.0
FUNCTIONAL OVERVIEW
This Data Sheet covers a family of four nonvolatile Dig-
ital Potentiometer and Rheostat devices that will be
referred to as MCP44XX. The MCP44X1 devices are
the Potentiometer configuration, while the MCP44X2
devices are the Rheostat configuration.
As the Device Block Diagram shows, there are four
main functional blocks. These are:
The POR/BOR operation and the Memory Map are
discussed in this section and the Resistor Network and
I2C operation are described in their own sections. The
commands are discussed in
4.1
POR/BOR and RESET Operation
The Power-on Reset is the case where the device is
having power applied to it from VSS. The Brown-out
Reset occurs when a device had power applied to it,
and that power (voltage) drops below the specified
range.
The devices RAM retention voltage (VRAM) is lower
than the POR/BOR voltage trip point (VPOR/VBOR). The
maximum VPOR/VBOR voltage is less then 1.8V.
When VPOR/VBOR < VDD < 2.7V, the electrical
performance
may
not
meet
the
data
sheet
specifications. In this region, the device is capable of
reading and writing to its EEPROM and incrementing,
decrementing, reading and writing to its volatile
memory if the proper serial command is executed.
When VDD < VPOR/VBOR or the RESET pin is Low, the
pin weak pull-ups are enabled.
4.1.1
POWER-ON RESET
When the device powers up, the device VDD will cross
the VPOR/VBOR voltage. Once the VDD voltage crosses
the VPOR/VBOR voltage, the following happens:
The volatile wiper register is loaded with value in
the corresponding nonvolatile wiper register
The TCON registers are loaded with their default
value
The device is capable of digital operation
4.1.2
BROWN-OUT RESET
When the device powers down, the device VDD will
cross the VPOR/VBOR voltage.
Once the VDD voltage decreases below the VPOR/VBOR
voltage, the following happens:
Serial Interface is disabled
EEPROM Writes are disabled
If the VDD voltage decreases below the VRAM voltage,
the following happens:
Volatile wiper registers may become corrupted
TCON registers may become corrupted
As the voltage recovers above the VPOR/VBOR voltage,
Serial commands not completed due to a brown-out
condition may cause the memory location (volatile and
nonvolatile) to become corrupted.
4.1.3
RESET PIN
The RESET pin can be used to force the device into
the POR/BOR state of the device. When the RESET
pin is forced Low, the device is forced into the reset
state. This means that the TCON and STATUS
registers are forced to their default values and the
volatile wiper registers are loaded with the value in the
corresponding Nonvolatile wiper register. Also the I2C
interface is disabled. Any nonvolatile write cycle is not
interrupted, and allowed to complete.
This feature allows a hardware method for all registers
to be updated at the same time.
4.1.4
INTERACTION OF RESET PIN AND
BOR/POR CIRCUITRY
Figure 4-1 shows how the RESET pin signal and the
POR/BOR signal interact to control the hardware reset
state of the device.
FIGURE 4-1:
POR/BOR Signal and
RESET Pin Interaction.
RESET (from pin)
POR/BOR signal
Device reset
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