MAX3320TCAP+

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Introduction

MAX3320TCAP+ is a 3.3V single low-power ESD protected RS232 transceiver with a programmable ESD protection function. It features a full-duplex RS232 line driver with a data rate up to 3Mbps. The device supports a wide range of applications and is suitable for a variety of communication interface applications. This article will discuss the application field and working principle of MAX3320TCAP+.

Application Fields

MAX3320TCAP+ is suitable for a variety of communication interface applications. Common application fields include application control system, medical equipment, display device, industrial automation, home automation, access control system, and home appliance. It is also used in automotive application such as in-car On-board-Diagnostics (OBD) system.

The MAX3320TCAP+ is designed to meet the stringent ESD requirements for automotive applications and has also been tested for CAN-bus EMC standard compliance. It can operate from a wide supply voltage range, from 2.7V to 5.5V, requiring very low power consumption and has a wide reference ground range from -0.3V to + 7V.

Working Principle

The MAX3320TCAP+ is a full-duplex RS232 transceiver. The output stages consist of two symmetrical signal paths with differential buffers. These buffers provide a high level of signal quality, low distortion, low noise and low power consumption. Output current can be matched across the whole full-duplex interface range. The ESD protection latch is programmable and it can protect up to ± 25kV ESD on the line bus.

The MAX3320TCAP+ has two independent transmitter/driver channels for full-duplex operation. Each channel is driven by a data line and a control line. The control line is used to enable the transmitter. The control line is an active low signal and the data line is a 3-state line. This allows the data bits to be encoded into the logic levels of the data line and transmitted when the control line is enabled.

The receive section also consists of two independent receiver channels for full-duplex operation. The input stages feature an internal hysteresis device which helps eliminate false triggering in noisy environments and increases EMC performance. An optional circuit is also available to reduce the total EMC performance further. A low-power Schmitt-trigger approach is applied to the receiver logic to reduce power consumption.

The MAX3320TCAP+ features an internal power-saving sense circuit which can reduce the power supply current when the line is idle. An internal low power Schmitt-trigger is applied to the logic inputs to further reduce the quiescent current.

Conclusion

The MAX3320TCAP+ is a low-power, ESD-protected full-duplex RS232 transceiver designed with automotive application in mind. It can operate in a wide supply voltage range and supports data rates up to 3Mbps. The transmitter/driver and receiver/detector features make it suitable for a variety of communication interface applications. The low-power Schmitt-trigger approach further reduces power consumption, making it ideal for battery-powered applications.

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