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| 型號： | KSZ9021RN-EVAL |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 44/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR KSZ9021RN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，以太網(wǎng)控制器（PHY 和 MAC） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | KSZ9021RN |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)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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2010 Microchip Technology Inc.
DS22265A-page 49
MCP444X/446X
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 four resistor networks. These are
referred to as Pot 0, Pot 1 Pot 2, and Pot 3.
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
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
Ω)
compared to larger resistance devices
(100.0 k
Ω).
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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