DAN-191 EXAR | Alldatasheet
Document overview
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Technical content
1.0 INTRODUCTION
2.0 BLUETOOTH ENHANCED DATA RATE
Data Rate (EDR) modulation mode supports data rates up to 3 Mbps.
3.0 UART HOST CONTROLLER INTERFACE
modules/chipsets have UARTs on their HCI that support data rates of 3Mbps. data rates up to 115200 bps. Hence, there is a need for high performance Exar UARTs. FIGURE 1. BLUETOOTH APPLICATION PROBLEM
115.2 Kbps
3 Mbps
EXAR UARTS IN BLUETOOTH APPLICATIONS
4.0 XR20M1170 IN BLUETOOTH APPLICATIONS
Exar’s XR20M1170 is a single channel I2C/SPI UART and it is ideal for Bluetooth applications for the reasons listed below. Since the SPI mode supports a 5MHz clock and the I2C interface only supports up to 400kHz, the SPI mode is recommended to achieve the highest performance.
4.1 High Performance
The XR20M1170 can easily support the 3Mbps data rate requirement. If necessary, the XR20M1170 can support UART serial data rates of up to 16Mbps. Data throughput and interrupt servicing can be optimized by utilizing the 64 byte TX and RX FIFOs.
4.2 Low Voltage Operation
The XR20M1170 can operation from 1.62V - 3.63V to directly interface with the lower voltage MCUs as well as the lower voltage Bluetooth chipsets.
4.3 Low Power Consumption
The XR20M1170 has a sleep mode to minimize the powe r consumption. In the sleep mode, the XR20M1170 consumes less than 30 uA. This will significantly help extend the battery lif e of the handheld/portable applications.
4.4 Small Package Size
The XR20M1170 is available in a 4x4mm QFN package which will require minimal board space.
4.5 Fractional Baud Rate Generator and 8X/4X Sampling Rate
In addition, with the combination of the Fractional Baud Rate Generator and 8X/4X sampling rate features, the XR20M1170 can take any existing clock source on the board (above 12MHz) to generate the 3Mbps UART data rate which further saves valuable PCB space.
5.0 CONCLUSION
With its low power consumpt ion, small package size and enhanced features, Exar’s XR20M1170 is the ideal solution for communication between an MCU and a Bluetooth module/chipset. F IGURE 2. XR20M1170 BLUETOOTH APPLICATIONS SOLUTION BLOCK DIAGRAM Bluetooth Module/ Chipset UART UART
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performanc e or reliability. EXAR Corp oration assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent in fringement. Charts and sc hedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not re commend the use of any of its products in life suppo rt applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the ri sk of injury or damage has been minimized; (b) the us er assumes all such risks; (c) potential liability of EXAR Corpor ation is adequately protected under the circumstances. Copyright 2008 EXAR Corporation Datasheet April 2008. Send your UART technical inquiry with technical details to hotline: uarttechsupport@exar.com. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. DAN191 REV. 1.0.0 EXAR UARTS IN BLUETOOTH APPLICATIONS