XR16M2550IL32-F Exar Corporation, XR16M2550IL32-F Datasheet - Page 10

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XR16M2550IL32-F

Manufacturer Part Number
XR16M2550IL32-F
Description
IC UART FIFO 16B 1.8V DUAL 32QFN
Manufacturer
Exar Corporation
Type
Dual UART with 16-byte FIFOsr
Datasheet

Specifications of XR16M2550IL32-F

Number Of Channels
2, DUART
Package / Case
32-VFQFN Exposed Pad
Features
*
Fifo's
16 Byte
Voltage - Supply
2.25 V ~ 3.6 V
With Auto Flow Control
Yes
With Irda Encoder/decoder
Yes
With False Start Bit Detection
Yes
With Modem Control
Yes
With Cmos
Yes
Mounting Type
Surface Mount
Data Rate
16 Mbps
Supply Voltage (max)
3.63 V
Supply Voltage (min)
1.62 V
Supply Current
0.5 mA to 2 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 45 C
Mounting Style
SMD/SMT
Operating Supply Voltage
1.62 V to 3.63 V
No. Of Channels
2
Uart Features
Two Independent UART Channels, Device Identification & Revision
Supply Voltage Range
1.62V To 3.63V
Operating Temperature Range
-40°C To +85°C
Rohs Compliant
Yes
Digital Ic Case Style
QFN
No. Of Pins
32
Filter Terminals
SMD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
1016-1285

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
XR16M2550IL32-F
Manufacturer:
ADI
Quantity:
469
Part Number:
XR16M2550IL32-F
Manufacturer:
EXAR/艾科嘉
Quantity:
20 000
XR16M2550
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100 ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see
Rate Generator is capable of operating with a crystal oscillator frequency of up to 24 MHz. However, with an
external clock input on XTAL1 pin, it can extend its operation up to 64 MHz (16 Mbps serial data rate) at 3.3V
with an 4X sampling rate. For further reading on the oscillator circuit please see the Application Note DAN108
on the EXAR web site at
Each UART has its own Baud Rate Generator (BRG) with a prescaler for the transmitter and receiver. The
prescaler is controlled by a software bit in the MCR register. The MCR register bit-7 sets the prescaler to divide
the input crystal or external clock by 1 or 4. The output of the prescaler clocks to the BRG. The BRG further
divides this clock by a programmable divisor between 1 and (216 - 0.0625) in increments of 0.0625 (1/16) to
obtain a 16X or 8X or 4X sampling clock of the serial data rate. The sampling clock is used by the transmitter
for data bit shifting and receiver for data sampling. The BRG divisor (DLL, DLM and DLD registers) defaults to
the value of ’1’ (DLL = 0x01, DLM = 0x00 and DLD = 0x00) upon reset. Therefore, the BRG must be
programmed during initialization to the operating data rate. The DLL and DLM registers provide the integer part
of the divisor and the DLD register provides the fractional part of the divisor. Only the four lower bits of the DLD
are implemented and they are used to select a value from 0 (for setting 0000) to 0.9375 or 15/16 (for setting
1111). Programming the Baud Rate Generator Registers DLL, DLM and DLD provides the capability for
selecting the operating data rate.
external clock at 16X clock rate. If the pre-scaler is used (MCR bit-7 = 1), the output data rate will be 4 times
less than that shown in
they would quadruple. Also, when using 8X sampling mode, please note that the bit-time will have a jitter (+/- 1/
16) whenever the DLD is non-zero and is an odd number. When using a non-standard data rate crystal or
external clock, the divisor value can be calculated with the following equation(s):
The closest divisor that is obtainable in the M2550 can be calculated using the following formula:
In the formulas above, please note that:
TRUNC (N) = Integer Part of N. For example, TRUNC (5.6) = 5.
ROUND (N) = N rounded towards the closest integer. For example, ROUND (7.3) = 7 and ROUND (9.9) = 10.
A >> B indicates right shifting the value ’A’ by ’B’ number of bits. For example, 0x78A3 >> 8 = 0x0078.
2.9
Required Divisor (decimal)=(XTAL1 clock frequency / prescaler) /(serial data rate x 16), with 16X mode, DLD[5:4]=’00’
Required Divisor (decimal)= (XTAL1 clock frequency / prescaler / (serial data rate x 8), with 8X mode, DLD[5:4] = ’01’
Required Divisor (decimal)= (XTAL1 clock frequency / prescaler / (serial data rate x 4), with 4X mode, DLD[5:4] = ’10’
ROUND( (Required Divisor - TRUNC(Required Divisor) )*16)/16 + TRUNC(Required Divisor), where
Programmable Baud Rate Generator with Fractional Divisor
Table
http://www.exar.com.
DLD = ROUND( (Required Divisor-TRUNC(Required Divisor) )*16)
5. At 8X sampling rate, these data rates would double. And at 4X sampling rate,
Table 5
DLL = TRUNC(Required Divisor) & 0xFF
DLM = TRUNC(Required Divisor) >> 8
shows the standard data rates available with a 24MHz crystal or
10
Figure
4). The programmable Baud
REV. 1.0.2

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