Each tap point (between the R
參數(shù)資料
型號(hào)： KSZ8051MLL-EVAL
廠商： Micrel Inc
文件頁(yè)數(shù)： 29/48頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR KSZ8051MLL
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，以太網(wǎng) PHY
嵌入式： 否
已用 IC / 零件： KSZ8051MLL
已供物品： 板
相關(guān)產(chǎn)品： 576-3888-6-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
576-3888-1-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
576-3888-2-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
KSZ8051MLL TR-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
576-3731-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
其它名稱： 576-3864
MCP413X/415X/423X/425X
DS22060B-page 38
2008 Microchip Technology Inc.
5.2
Wiper
Each tap point (between the RS resistors) is a
connection point for an analog switch. The opposite
side of the analog switch is connected to a common
signal which is connected to the Terminal W (Wiper)
pin.
A value in the volatile wiper register selects which
analog switch to close, connecting the W terminal to
the selected node of the resistor ladder.
The wiper can connect directly to Terminal B or to
Terminal A. A zero-scale connections, connects the
Terminal W (wiper) to Terminal B (wiper setting of
000h). A full-scale connections, connects the Terminal
W (wiper) to Terminal A (wiper setting of 100h or 80h).
In these configurations the only resistance between the
Terminal W and the other Terminal (A or B) is that of the
analog switches.
A wiper setting value greater than full-scale (wiper
setting of 100h for 8-bit device or 80h for 7-bit devices)
will also be a Full-Scale setting (Terminal W (wiper)
connected to Terminal A). Table 5-1 illustrates the full
wiper setting map.
Equation 5-2 illustrates the calculation used to deter-
mine the resistance between the wiper and terminal B.
EQUATION 5-2:
RWB CALCULATION
TABLE 5-1:
VOLATILE WIPER VALUE VS.
WIPER POSITION MAP
A POR/BOR event will load the Volatile Wiper register
value with the default value. Table 5-2 shows the
default values offered. Custom POR/BOR options are
available. Contact the local Microchip Sales Office.
TABLE 5-2:
DEFAULT FACTORY
SETTINGS SELECTION
Wiper Setting
Properties
7-bit Pot 8-bit Pot
3FFh
081h
3FFh
101h
Reserved (Full-Scale (W = A)),
Increment and Decrement
commands ignored
080h
100h
Full-Scale (W = A),
Increment commands ignored
07Fh
041h
0FFh
081
W = N
040h
080h
W = N (Mid-Scale)
03Fh
001h
07Fh
001
W = N
000h
Zero Scale (W = B)
Decrement command ignored
R
WB
R
ABN
256
()
--------------R
W
+
=
N = 0 to 256 (decimal)
R
WB
R
ABN
128
()
--------------R
W
+
=
N = 0 to 128 (decimal)
8-bit Device
7-bit Device
Res
ist
an
ce
Code
Ty
p
ic
al
R
AB
Va
lu
e
Default
POR
Wi
p
e
rSe
tt
in
g
Wiper Code
8-bit
7-bit
-502
5.0 k
Mid-scale
80h
40h
-103
10.0 k
Mid-scale
80h
40h
-503
50.0 k
Mid-scale
80h
40h
-104
100.0 k
Mid-scale
80h
40h
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KSZ8051MLLI 功能描述:以太網(wǎng) IC 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver w/ MII Support (48-LQFP, Industrial Grade) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
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