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參數(shù)資料
| 型號(hào)： | KSZ8051RNLI TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 29/59頁 |
| 文件大小： | 0K |
| 描述： | TXRX PHY 10/T100 3.3V RMII 32QFN |
| 特色產(chǎn)品： | KSZ8051/8031/8021 Series |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | PHY 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RMII |
| 電源電壓： | 1.8V，2.5V，3.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN（5x5） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | 576-3889-6 |
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2008 Microchip Technology Inc.
DS22059B-page 35
MCP414X/416X/424X/426X
5.0
RESISTOR NETWORK
The Resistor Network has either 7-bit or 8-bit
resolution. Each Resistor Network allows zero scale to
full scale connections. Figure 5-1 shows a block
diagram for the resistive network of a device.
The Resistor Network is made up of several parts.
These include:
Resistor Ladder
Wiper
Shutdown (Terminal Connections)
Devices have either one or two resistor networks,
These are referred to as Pot 0 and Pot 1.
FIGURE 5-1:
Resistor Block Diagram.
5.1
Resistor Ladder Module
The resistor ladder is a series of equal value resistors
(RS) with a connection point (tap) between the two
resistors. The total number of resistors in the series
(ladder)
determines
the
RAB resistance (see
Figure 5-1). The end points of the resistor ladder are
connected to analog switches which are connected to
the device Terminal A and Terminal B pins. The RAB
(and RS) resistance has small variations over voltage
and temperature.
For an 8-bit device, there are 256 resistors in a string
between terminal A and terminal B. The wiper can be
set to tap onto any of these 256 resistors thus providing
257 possible settings (including terminal A and terminal
B).
For a 7-bit device, there are 128 resistors in a string
between terminal A and terminal B. The wiper can be
set to tap onto any of these 128 resistors thus providing
129 possible settings (including terminal A and terminal
B).
Equation 5-1 shows the calculation for the step
resistance.
EQUATION 5-1:
RS CALCULATION
RS
A
RS
B
257
256
255
1
0
RW (1)
W
(01h)
Analog Mux
RW (1)
(00h)
RW (1)
(FEh)
RW (1)
(FFh)
RW (1)
(100h)
Note 1:
The wiper resistance is dependent on
several factors including, wiper code,
device VDD, Terminal voltages (on A, B,
and W), and temperature.
Also for the same conditions, each tap
selection resistance has a small variation.
This RW variation has greater effects on
some specifications (such as INL) for the
smaller
resistance
devices
(5.0 k)
compared to larger resistance devices
(100.0 k).
RAB
8-Bit
N =
128
127
126
1
0
(01h)
(00h)
(7Eh)
(7Fh)
(80h)
7-Bit
N =
R
S
R
AB
256
()
-------------
=
R
S
R
AB
128
()
--------------
=
8-bit Device
7-bit Device
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