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| 型號： | KSZ8041NLJ TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 38/43頁 |
| 文件大?。?/td> | 0K |
| 描述： | TXRX PHY 10/100 3.3V 32MLF |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | MII，RMII |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤，32-MLF? |
| 供應(yīng)商設(shè)備封裝： | 32-MLF?（5x5） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | 576-3625-6 |
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2012 Microchip Technology Inc.
DS25118C-page 43
MCP47DA1
6.0
RESISTOR NETWORK
The Resistor Network is made up of an R1 resistor, an
RAB resistor ladder, and an R2 resistor connected
together. These three resistors are equal (R1 = RAB =
R2) each with a typical resistance of 10k . The R1
resistor is also connected to the external VREF pin while
the R2 resistor is also internally connected to ground.
Figure 6-1 shows a block diagram for the resistor net-
work and output buffer. The resistance from the VREF
pin to ground is referred to as RVREF.
The 7-bit I2C Data Byte (00h - 7Fh) is decoded to the 6-
bit wiper value (00h - 40h). Section 6.4 describes the
Serial Shift buffer to Wiper register decoding.
6.1
RVREF Resistance
RVREF resistance is the resistance from the VREF pin to
ground and is the sum of the R1, RAB, and R2 resis-
6.1.1
VREF PIN CURRENT (IVREF)
The current into the VREF pin is dependent on the volt-
age on the VREF pin (VREF) and the RVREF resistance.
The VREF pin’s voltage source current capability should
support a resistive load that is the minimum RVREF
resistance.
EQUATION 6-1:
CALCULATING RVREF
6.2
R1 and R2 Fixed Resistors
The R1 and R2 resistors are implemented so that based
on temperature and process variations, these resistors
track the RAB resistor ladder. The typical R1 and R2
resistances are 10k
.
6.3
RAB Resistor Ladder
The RAB resistor ladder is a digital potentiometer in a
voltage divider configuration. The RAB resistor ladder
has 64 RS resistors in series. This resistor ladder has
65 wiper taps which allow wiper connectivity to the bot-
tom (terminal B), Zero-Scale, and the top (terminal A),
Full-Scale, of the resistor ladder (see Figure 6-1). With
an even number of RS resistors in the RAB ladder, when
the wiper is at the Mid-Scale value, VOUT equals VREF
/ 2. The RAB resistance also includes the RFS and RZS
resistance has small variations over voltage and tem-
perature. The typical RAB resistance is 10k .
6.3.1
THE WIPER
The 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 reg-
ister value is derived from the Serial Shift Register
value (see Section 6.4).
Any variation of the wiper resistance does not effect the
voltage at the W terminal, and therefore the input of the
output buffer.
6.3.2
RFS AND RZS RESISTORS
The RFS and RZS resistances are artifacts of the RAB
resistor implementation. These resistors are included
in the block diagram to help better model the actual
device operation. Equation 6-2 shows how to estimate
the RS, RFS, and RZS resistances, based on the
measured voltages of VREF, VFS, and VZS and the
measured current IVREF.
EQUATION 6-2:
ESTIMATING RS, RFS,
AND RZS
RVREF =
(VREF)
(IVREF)
VREF is the voltage on the VREF pin.
IVREF is the current into the VREF pin.
VFS is the VOUT voltage when the wiper code is at
full-scale (SSR = 60h through 7Fh).
VZS is the VOUT voltage when the wiper code is at
zero-scale (SSR = 00h through 20h).
RFS =
( (VREF - (64 * VS) ) - VFS )
(IVREF)
RZS =
( VZS - (64 * VS) )
(IVREF)
VS =
( VFS - VZS )
64
Where:
RS =
VS
IVREF
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| KSZ8041NLTR | 制造商:Micrel 功能描述:PHY TxFx 3.3V 10/100, KSZ8041NL |
| KSZ8041NL-TR | 功能描述:1/1 Transceiver Full MII, RMII 32-MLF? (5x5) 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:收發(fā)器 協(xié)議:MII，RMII 驅(qū)動器/接收器數(shù):1/1 雙工:全 接收器滯后:- 數(shù)據(jù)速率:- 電壓 - 電源:3.135 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:32-VFQFN 裸露焊盤，32-MLF? 供應(yīng)商器件封裝:32-MLF?（5x5） 標(biāo)準(zhǔn)包裝:1 |
| KSZ8041RNL | 功能描述:TXRX 10/100 3.3V PHY RMII 32-MLF RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KSZ8041RNL TR | 功能描述:以太網(wǎng) IC 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver with RMII Support - Lead Free 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 |
| KSZ8041RNL-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver with RMII Support - Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
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