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XR20M1170G16-0B Datasheet, PDF (1/56 Pages) Exar Corporation – I2C/SPI UART WITH 64-BYTE FIFO | |||
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XR20M1170
I2C/SPI UART WITH 64-BYTE FIFO
JULY 2012
REV. 1.1.0
GENERAL DESCRIPTION
The XR20M11701 (M1170) is a high performance
universal asynchronous receiver and transmitter
(UART) with 64 byte TX and RX FIFOs and a
selectable I2C/SPI slave interface. The M1170
operates from 1.62 to 3.63 volts. The enhanced
features in the M1170 include a programmable
fractional baud rate generator, an 8X and 4X
sampling rate that allows for a maximum baud rate of
16 Mbps at 3.3V. The standard features include 16
selectable TX and RX FIFO trigger levels, automatic
hardware (RTS/CTS) and software (Xon/Xoff) flow
control, and a complete modem interface. Onboard
registers provide the user with operational status and
data error flags. An internal loopback capability
allows system diagnostics. The M1170 is available in
the 24-pin QFN, 16-pin QFN, 24-pin TSSOP and 16-
pin TSSOP packages.
NOTE: 1 Covered by U.S. Patent #5,649,122
APPLICATIONS
⢠Portable Appliances
⢠Battery-Operated Devices
⢠Cellular Data Devices
⢠Factory Automation and Process Controls
FEATURES
⢠1.62 to 3.6 Volt Operation
⢠Selectable I2C/SPI Interface
⢠SPI clock frequency up to
â 18 MHz at 3.3 V
â 16 MHz at 2.5 V
â 8 MHz at 1.8 V
⢠Full-featured UART
â Data rate of up to 16 Mbps at 3.3 V
â Data rate of up to 12.5 Mbps at 2.5 V
â Data rate of up to 8 Mbps at 1.8 V
â Fractional Baud Rate Generator
â Transmit and Receive FIFOs of 64 bytes
â 16 Selectable TX and RX FIFO Trigger Levels
â Automatic Hardware (RTS/CTS) Flow Control
â Automatic Software (Xon/Xoff) Flow Control
â Halt and Resume Transmission Control
â Automatic RS-485 Half-duplex Direction
Control Output via RTS#
â Wireless Infrared (IrDA 1.0 and 1.1) Encoder/
Decoder
â Automatic sleep mode (< 15 uA at 3.3V)
â General Purpose I/Os
â Full modem interface
⢠Crystal oscillator (up to 24MHz) or external clock
(up to 64MHz) input
⢠24-QFN, 16-QFN, 24-TSSOP, 16-TSSOP
packages
FIGURE 1. XR20M1170 BLOCK DIAGRAM
VCC
IRQ#
SDA
SCL
A0/CS#
A1/SI
SO
I2C/SPI#
1.62V â 3.63V
I2C/SPI
Interface
UART
Regs
64 Byte
TX FIFO
64 Byte
RX FIFO
BRG
GPIOs
Crystal Osc/Buffer
TX
RX
RTS#
CTS#
GPIO[7:0]
XTAL1
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 ⢠(510) 668-7000 ⢠FAX (510) 668-7017 ⢠www.exar.com
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