MAX3238CDBG4

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The MAX3238CDBG4 is an RS-232 interface integrated circuit with simplified line-driver and receiver circuitry, supporting data rates up to 330 kilobits per second in half-duplex mode. This chip requires no external components, making it easier to implement in a board layout. It is designed to reduce power consumption by automatically entering low-power sleep mode, eliminating the need for any external power-down circuitry.

The MAX3238CDBG4 is part of a family of integrated circuits available from Maxim Integrated Products that are used for providing EIA-232 (formerly RS-232) interface. It targets applications that require a low power, low cost, and low pin count solution for providing an RS-232 interface. The MAX3238CDBG4 meets the requirements of most RS-232 interface-design applications, as it supports a wide range of data rates (1k–330k baud).

Functional Description

The MAX3238CDBG4 provides a full RS-232 compliant interface and includes two receivers, two drivers, and a control logic circuit. The receivers are designed to detect logic high and logic low signals, along with the control logic required to decode signals to create a high level serial data output. The drivers output their data in a half-duplex format, meaning that they are designed to selectively drive either the positive or the negative side of an RS-232 signal.

Architecture

The MAX3238CDBG4 consists of two parallel driver/receiver channels, each providing an RS-232 compliant serial data output. A logic block controls the data interface between each of the two channels and two optional external amplifier inputs. Each of the two channel pairs includes a low-power RS-232 driver, two RS-232 receivers, and a control logic circuit. The receiver inputs detect both inverted (missing 0 pulse) and non-inverted (missing 1 pulse) signals. The driver output\'s conformance to the EIA-232 interface standard is guaranteed by an on-chip fail-safe circuitry. The control logic circuit is designed to decode the start and stop bits of the transmitted data, and to form these bits into a valid word that is then output to an active low RS-232 tranceiver input. This, in turn, will drive a series of six RS-232 outputs.

Transmitting Data

The transmitted data is composed of a start, followed by 8-bit data and a stop bit. The start bit signals the receiver that a valid word is about to be transmitted. The data is sent with least significant bit (LSB) first. Finally, the stop bit is sent to indicate that the data has been completed. The MAX3238CDBG4 driver will fill the bitstream with ones when the transmit data stream is empty. As the low-power driver is built into the chip, no external drivers are needed. The data indicated by the external inputs is sent serially over the RS-232 transceiver.

Receiving Data

The receiver will detect the start bit and count the trailing bits to determine if a valid word has been received. The receiver logic is designed to detect both inverted (missing 0 pulse) and non-inverted (missing 1 pulse) signals. This capability allows the receiver to recognize any valid start and stop bits. The receiver will ignore any transmissions that do not comprise a valid start and stop bit sequence. When the received data stream contains errors, the receiver will ignore these errors and output the valid data.

Local Logic Control

The local logic control circuitry includes an enable/disable logic circuit. When powered up, the enable logic will reset the driver/receiver circuitry, thereby disabling receiver and driver functions. Once an externally connected device such as a microcontroller switches the enable high, the receiver will be enabled, and the driver will be enabled (unless the module is in the sleep mode). The receiver will then detect the start bit of the incoming data stream and output the valid data.

Sleep Mode

The MAX3238CDBG4 is designed to reduce power consumption by automatically entering a low-power sleep mode. This feature eliminates the need for any external power-down circuitry. When the local logic control detects the enable logic low, the driver is turned off and an internal pull-down is activated to reduce the power consumption of the device. This feature allows the user to conserve power when implementing systems in which the RS-232 interface is only used at certain times.

Conclusion

The MAX3238CDBG4 integrated circuit is an advanced RS-232 interface chip that provides simplified line-driving and receiving circuitry. It includes two receivers, two drivers, and a control logic circuit. This chip reduces power consumption by automatically entering low-power sleep mode, eliminating the need for any external power-down circuitry. The chip supports data rates up to 330 kilobits per second in half-duplex mode, and is ideal for applications that require a low power, low cost, and low pin count solution for providing an RS-232 interface.

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