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參數(shù)資料
| 型號： | MAX14821EVKIT# |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL KIT MAX14821 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，收發(fā)器 |
| 已用 IC / 零件： | MAX14821 |
| 主要屬性： | IO和SPI接口端子 |
| 次要屬性： | 圖形用戶界面 |
| 已供物品： | 板，線纜，軟件 |
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MAX14821
IO-Link Device Transceiver
27
Maxim Integrated
Applications Information
UART Interfacing
The logic levels of the microcontroller interface I/Os
(TXC, TXQ, TXEN, and RX) are defined by VL.
The device can be interfaced to microcontrollers where
the on-board UART TX output cannot be programmed as
a logic output (GPO). In this case, connect the TX output
of the UART to the TXC input for IO-Link communication
and connect a separate GPO output on the microcon-
troller to TXQ for standard IO (SIO) mode operation
(Figure 13). As the TXQ and TXC inputs are internally
logically ANDed, the unused input (TXC or TXQ) must be
held high while the other is in operation.
Transient Protection
Inductive load switching, surges, and bursts create high
transient voltages. C/Q, DO, and DI should be protected
against high overvoltage and undervoltage transients.
Positive voltage transients on C/Q, DO, and DI must be
limited to +55V relative to GND and negative voltage
transients must be limited to -55V (relative to VCC) on DO
and C/Q and to -55V (relative to GND) on DI. Figure 14
shows suitable protection using TVS diodes to meet both
the IEC 61000-4-2 ESD and IEC 61000-4-5 surge testing.
Other protection schemes may also be suitable.
The device has to be protected against transients that
occur during hot-plugging of the L+ sensor supply (VCC
input). This is achieved by placing a 10
W resistor with
1F capacitor before LDOIN and connecting an RC
between the sensor supply input and the VCC pin, as
shown in Figure 14. The RC time constant of the filter on
VCC should be larger or equal to 0.8s. In case that VL is
supplied by V5 and the bypass capacitor on V5 is 100nF,
the 10
W resistor in series with LDOIN is not needed.
Optional External Powering
The MAX14821 is powered by VCC and V5. VL is a
reference voltage input to set the logic levels of the
microcontroller interface. The logic and SPI interface are
operational when V5 and VL are present even if VCC is
not present.
The VP output provides a reverse-polarity-protected
voltage one diode drop below VCC and can be used
for supplying external circuitry, like power supplies. The
current drawn from VP cannot exceed 50mA. Be aware
that capacitance on VP can cause transient currents at
power-up equal to C x dVCC/dt.
In order to reduce power dissipated in the device, an
reverse protection diode can be used to power the exter-
nal circuitry, instead of using VP, as shown in Figure 15.
V5 is typically powered by the internal 5V regulator, but
can alternatively be powered by an external 5V regula-
tor. When powering V5 externally, connect LDOIN to V5.
(Figure 15). This configuration disables operation of the
internal 5V regulator and reduces the on-chip power
consumption.
When an external 5V regulator is used to power V5, the
V5 bypass capacitance is determined by that regulator,
and is not limited to 100nF.
Figure 13. UART Interface
Figure 14. MAX14821 Operating Circuit with TVS Protection
MICROCONTROLLER
TXQ
GPO
TXC
TX
TXEN
RTS
RX
MAX14821
0.8
1F
VCC
LDOIN
DO
1/2
SDC36C
1/2
SDC36C
GND
C/Q
1/2
SDC36C
DI
VP
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX14821EVKIT# | 功能描述:界面開發(fā)工具 MAX14820/21 EVAL KIT RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| MAX14821EWA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX14821EWA+T | 功能描述:輸入/輸出控制器接口集成電路 100mA IO-Link Transceiver RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX14824ETG+ | 功能描述:輸入/輸出控制器接口集成電路 IO-Link Master Transceiver RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX14824ETG+T | 功能描述:輸入/輸出控制器接口集成電路 IO-Link Master Transceiver RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
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