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XR16M781 PDF даташит
| Спецификация XR16M781 изготовлена «Exar Corporation» и имеет функцию, называемую «1.62V TO 3.63V UART». |
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Детали детали
| Номер произв | XR16M781 |
| Описание | 1.62V TO 3.63V UART |
| Производители | Exar Corporation |
| логотип |  |
30 Pages
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XR16M781
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
AUGUST 2009
REV. 1.0.1
GENERAL DESCRIPTION
The XR16M7811 (M781) is an enhanced Universal
Asynchronous Receiver and Transmitter (UART) with
a VLIO bus interface and has 64 bytes of transmit
and receive FIFOs, programmable transmit and
receive FIFO trigger levels, automatic hardware and
software flow control, and data rates of up to 20 Mbps
at 3.3V, 16 Mbps at 2.5V and 10 Mbps at 1.8V with
4X data sampling rate.
The Auto RS-485 Half-Duplex Direction control
feature simplifies both the hardware and software for
half-duplex RS-485 applications. In addition, the
Multidrop mode with Auto Address detection
increases the performance by simplifying the
software routines.
The Independent TX/RX Baud Rate Generator
feature allows the transmitter and receiver to operate
at different baud rates. Power consumption of the
M781 can be minmized by enabling the sleep mode
and PowerSave mode.
The M781 has a 16550 compatible register set that
provide users with operating status and control,
receiver error indications, and modem serial interface
controls. An internal loopback capability allows
onboard diagnostics. The M781 is available in 24-pin
QFN, 32-pin QFN and 25-pin BGA packages.
NOTE: 1 Covered by U.S. Patent #5,649,122.
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FEATURES
• VLIO bus interface
• Pin-to-pin compatible with SC16C850V and
SC16C850SV in 32-QFN package
• 20 Mbps maximum data rate
• Programmable TX/RX FIFO Trigger Levels
• TX/RX FIFO Level Counters
• Independent TX/RX Baud Rate Generator
• Fractional Baud Rate Generator
• Auto RTS/CTS Hardware Flow Control
• Auto XON/XOFF Software Flow Control
• Auto RS-485 Half-Duplex Direction Control
• Multidrop mode w/ Auto Address Detect
• Sleep Mode with Automatic Wake-up
• PowerSave mode
• Infrared (IrDA 1.0 and 1.1) mode
• 1.62V to 3.63V supply operation
• Crystal oscillator or external clock input
APPLICATIONS
• Personal Digital Assistants (PDA)
• Cellular Phones/Data Devices
• Battery-Operated Devices
• Global Positioning System (GPS)
• Bluetooth
FIGURE 1. XR16M781 BLOCK DIAGRAM
PwrSave
LLA#
AD7:AD0
IOR#
IO W #
CS#
INT
RESET#
VLIO Bus
Interface
TX
BRG 64 Byte TX FIFO
UART
IR TX &
Regs ENDEC RX
RX
BRG
64 Byte RX FIFO
Crystal Osc/Buffer
VCC
(1.62 to 3.63 V)
GND
TX, RX,
RTS#, CTS#,
DTR#, DSR#,
RI#, CD#
XTAL1
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
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XR16M781
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
FIGURE 2. PIN OUT ASSIGNMENT
REV. 1.0.1
18 17 16 15 14 13
VCC 19
12
AD0 20
11
AD1 21
AD2 22
24-pin QFN 10
9
AD3 23
8
AD4 24
7
123456
IOR#
GND
IOW#
XTAL2
XTAL1
PWRSAVE
24 23 22 21 20 19 18 17
DSR#
CD#
RI#
VCC
AD0
AD1
AD2
AD3
25
26
27
28
29
30
31
32
32-pin QFN
16 NC
15 NC
14 IOR#
13 GND
12 IOW#
11 XTAL2
10 XTAL1
9 PWRSAVE
12345678
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A1 Corner
12 34 5
A
B
C
D
E
CTS#
VCC
AD0
AD3
AD4
Transparent Top View
RESET#
AD5
AD7
AD1
AD2
RTS#
DTR#
RX
CS#
AD6
LLA#
INT
DSR#
PWRSAVE
TX
IOR#
GND
XTAL2
XTAL1
IOW#
ORDERING INFORMATION
PART NUMBER
XR16M781IL24
XR16M781IL32
XR16M781IB25
PACKAGE
24-Pin QFN
32-Pin QFN
25-Pin BGA
OPERATING TEMPERATURE
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
DEVICE STATUS
Active
Active
Active
2
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REV. 1.0.1
PIN DESCRIPTIONS
XR16M781
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
Pin Description
NAME
24-QFN
PIN#
32-QFN
PIN#
25-BGA
PIN#
TYPE
DESCRIPTION
DATA BUS INTERFACE
AD0 20 29 C1 I/O Multiplexed Address/Data lines [7:0]. The register address is
AD1 21 30 D2
latched on the rising edge of the LLA#. After the LLA# signal goes
AD2 22 31 E2
AD3 23 32 D1
high, the UART enters the data phase where the data is placed on
these lines.
AD4 24 1 E1
AD5 1 3 B2
AD6 2 4 E3
AD7 3 5 C2
IOR# 12 14 A5 I Read strobe (active low). The falling edge instigates an internal
read cycle and retrieves the data byte from an internal register
pointed by the latched address. The UART places the data byte on
the data bus to allow the host processor to read it on the rising
edge.
IOW# 10 12 E5 I Write strobe (active low). The falling edge instigates the internal
write cycle and the rising edge transfers the data byte on the data
bus to an internal register pointed by the latched address.
CS# 6 8 D3 I Chip select (active low). The falling edge starts the access to the
UART. A read or write is determined by the IOR# and IOW# sig-
nals.
LLA# 14 19 A4 I Latch Lower Address (active low). The register address is latched
on the rising edge of the LLA# signal. After the LLA# goes high, the
device enters the data phase where the data is placed on the
AD[7:0] lines.
INT 15 20 B4 O Interrupt output (active high). The output state is defined by the
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user through the software setting of MCR[3]. INT is set to the active
mode when MCR[3] is set to a logic 1. INT is set to the three state
mode when MCR[3] is set to a logic 0. See MCR[3].
MODEM OR SERIAL I/O INTERFACE
TX 5 7 E4
RX 4 6 C3
RTS# 16 21 A3
O UART Transmit Data or infrared encoder data. Standard transmit
and receive interface is enabled when MCR[6] = 0. In this mode,
the TX signal will be a logic 1 during reset or idle (no data). Infrared
IrDA transmit and receive interface is enabled when MCR[6] = 1. In
the Infrared mode, the inactive state (no data) for the Infrared
encoder/decoder interface is a logic 0. If it is not used, leave it
unconnected.
I UART Receive Data or infrared receive data. Normal receive data
input must idle at logic 1 condition. The infrared receiver idles at
logic 0. This input should be connected to VCC when not used.
O UART Request-to-Send (active low) or general purpose output.
This output must be asserted prior to using auto RTS flow control,
see EFR[6], MCR[1] and IER[6]. This pin can also be used as the
Auto RS-485 Half-duplex Direction control output, see FCTR[3] and
EMSR[3].
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| Номер в каталоге | Описание | Производители |
| XR16M780 | 1.62V TO 3.63V HIGH PERFORMANCE UART | Exar Corporation |
| XR16M781 | 1.62V TO 3.63V UART | Exar Corporation |
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