Product category:
Communications ICs (Wired)
News Release from: Freescale Semiconductor | Subject: MC33897
Edited by the Electronicstalk Editorial
Team on 21 April 2005
CAN transceivers run on a single wire
Freescale's MC33897 single-wire CAN transceivers allow the popular CAN protocol to be transmitted over one wire rather than two.
Dual-wire CAN transceivers are used in high- and medium-speed applications with the primary goal of data transfer Advanced automotive networks and applications such as power windows and door locks, seat and mirror controls and internal digital temperature gauges do not require high-speed data transmission
This article was originally published on Electronicstalk on 20 Mar 2001 at 8.00am (UK)
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The extra power dual-wire CAN transceivers provide is wasted in these applications and can unnecessarily increase the cost of the system.
In cost-sensitive applications, single-wire CAN solutions provide an adequate speed and cost alternative.
Freescale's MC33897 single-wire CAN transceivers allow the popular CAN protocol to be transmitted over one wire rather than two.
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The result is cost reduction for networks that don't require full, high-speed CAN transmissions.
The 8- and 14-pin devices drop into the same board layout, allowing designers additional cost savings and increased flexibility.
"By being dual pin-compatible, our MC33987 devices allow designers to trade off features and costs to fully meet the needs of automobile consumers", said Demetre Kondylis, General Manager of Freescale's Sensor and Analogue Products Business.
"Introducing flexibility through 8- and 14-pin single-wire CAN transceivers is one more way Freescale is driving innovation into the automotive industry".
The MC33897 is designed in accordance with the General Motors Corporation GMW3089v2.3 single wire CAN physical layer specification.
The devices also support features such as low sleep-mode current that minimises battery drain, bus signal waveshaping that meets automotive electromagnetic compatibility (EMC) requirements and a broad range of protection features that prevent faulted nodes from interfering with other network communications.
Operating directly from a vehicle's 12V battery system or a local DC power source, the MC33897 functions at either low or high datarates.
The MC33897 incorporates many safety and performance-enhancing features.
A high-voltage wake-up feature allows the MC33897 and MC33897A devices to control the external regulator used to supply a microcontroller (MCU) and other logic.
The system MCU can command a low-power sleep mode via mode pins, which causes the MC33897 and MC33897A to turn off the external regulator.
The presence of a defined wake-up voltage level on the bus reactivates the control line to turn the regulator and the system back on.
The MC33897 and MC33897A 14-pin devices are in production and available today at a suggested retail price of US $0.87 per unit in 10,000-unit quantities.
The MC33897B 8-pin device is available in sample quantities now.
Production quantities are planned for Q3 2005 at a suggested retail price of US $0.76 per unit in 10,000-unit quantities.
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