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參數(shù)資料
| 型號： | IL41050TE |
| 廠商： | NVE Corp/Isolation Products |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX ISOLATED CAN HS 16SOIC |
| 產(chǎn)品目錄繪圖： | IL41050 Circuit |
| 特色產(chǎn)品： | Isolated High-Speed CAN Transceiver |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 系列： | IsoLoop® |
| 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： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 2771 (CN2011-ZH PDF) |
| 其它名稱： | 390-1131 |
IL41050
6
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
Application Information
V
DD2 Power Supply Pins
Both VDD2 power supply inputs (pins 11 and 16) must be connected to the bus-side power supply. Pin 11 powers the bus side of the CAN I/O
circuitry, while pin 16 powers the bus-side isolation circuitry. For testing purposes, they are not internally connected, but the part will not operate
without both pins powered, and operation without both pins powered can cause damage.
Power Supply Decoupling
Both VDD1 and VDD2 must be bypassed with 100 nF ceramic capacitors. These supply the dynamic current required for the isolator switching and
should be placed as close as possible to VDD and their respective ground return pins.
Input Configurations
The TxD input should not be left open as the state will be indeterminate. If connected to an open-drain or open collector output, a pull-up resistor
(typically 16 k
Ω) should be connected from the input to V
DD
1.
The Mode Select (“S”) input has a nominal 150 k
Ω internal pull-down resistor. It can be left open or set low for normal operation.
Dominant Mode Time-out and Failsafe Receiver Functions
CAN bus latch up is prevented by an integrated Dominant mode timeout function. If the TxD pin is forced permanently low by hardware or
software application failure, the time-out returns the RxD output to the high state no more than 765 μs after TxD is asserted dominant. The timer
is triggered by a negative edge on TxD. If the duration of the low is longer than the internal timer value, the transmitter is disabled, driving the
bus to the recessive state. The timer is reset by a positive edge on pin TxD.
If power is lost on Vdd2, the IL41050 asserts the RxD output high when the supply voltage falls below 3.8 V. RxD will return to normal
operation as soon as Vdd2 rises above approximately 4.2 V.
Programmable Power-Up
A unique non-volatile programmable power-up feature prevents unstable nodes. A state that needs to be present at node power up can be
programmed at the last power down. For example if a CAN node is required to “pulse” dominant at power up, TxD can be sent low by the
controller immediately prior to power down. When power is resumed, the node will immediately go dominant allowing self-check code in the
microcontroller to verify node operation. If desired, the node can also power up silently by presetting the TxD line high at power down. At the
next power on, the IL41050 will remain silent, awaiting a dominant state from the bus.
The microcontroller can check that the CAN node powered down correctly before applying power at the next “power on” request. If the node
powered down as intended, RxD will be set high and stored in IL41050’s non-volatile memory. The level stored in the RxD bit can be read
before isolated node power is enabled, avoiding possible CAN bus disruption due to an unstable node.
Replacing Non-Isolated Transceivers
The IL41050 is designed to replace common non-isolated CAN transceivers such as the Philips/NXP TJA1050 with minimal circuit changes.
Some notable differences:
Some non-isolated CAN transceivers have internal TxD pull-up resistors, but the IL41050 TxD input should not be left open. If
connected to an open-drain or open collector output, a pull-up resistor (typically 16 k
Ω) should be connected from the input to V
DD
1.
Initialization behavior varies between CAN transceivers. To ensure the desired power-up state, the IL41050 should be initialized with a
TxD pulse (low-to-high for recessive initialization), or shut down the transceiver in the desired power-up state (the “programmable
power-up feature”).
Many non-isolated CAN transceivers have a VREF output. Such a reference is available on the IL41050 wide-body version.
The VREF Output
VREF is a reference voltage output used to drive bus threshold comparators in some legacy systems and is provided on the IL41050 wide-body
version. The output is half of the bus supply ±10% (i.e., 0.45 V
DD
2 < VREF < 0.55 VDD2), and can drive up to 50 A.
IsoRxD / IsoTxD Outputs
The IsoRxD and IsoTxD outputs are isolated versions of the RxD and TxD signals. These outputs are provided on the narrow-body version for
troubleshooting, but normally no connections should be made to the pins.
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