MAX3107EAG+T Maxim Integrated Products, MAX3107EAG+T Datasheet - Page 17

• Manufacturer Part Number: MAX3107EAG+T
• Description: IC UART SPI/I2C 128 FIFO 24SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX3107EAG+T

• Features: Internal Oscillators
• Number Of Channels: 4, QUART
• Fifo's: 128 Byte
• Protocol: RS232, RS485
• Voltage - Supply: 2.35 V ~ 3.6 V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX3107EAG+T; MAX3107EAG+TTR

Figure 6. Receive FIFO
The internal 614.4kHz oscillator does not require exter-
nal components and provides a source for baud-rate
generation. The internal oscillator normally requires the
use of the internal PLL (see the PLL and Predivider sec-
tion) to achieve common baud rates. Set CLKSource[4]:
Figure 7. Clock Selection Diagram
CURRENT FILL LEVEL
I
2
C/SPI INTERFACE
LSR[5:2]
LSR[1]
LSR[0]
ISR[3]
ISR[6]
XOUT
OVERRUN
______________________________________________________________________________________
TIMEOUT
TRIGGER
ERRORS
EMPTY
XIN
FIFOTrgLvl[7:4]
RECEIVE FIFO
OSCILLATOR
OSCILLATOR
RxFIFOLvl
INTERNAL
CRYSTAL
IntOscEn
WORD
SPI/I
RECEIVER
RHR
Internal Oscillator
ERROR 128
CrystalEn
2
C UART with 128-Word FIFOs
4
3
2
1
RECEIVED
DATA
ExtClock
RX
ExtClock to 0 and CLKSource[0]: IntOscEn to 1 to select
and enable the internal oscillator.
If a higher baud-rate accuracy or low-power consump-
tion is required, the crystal oscillator or an external clock
source can be used. Set CLKSource[4]: ExtClock to 1
and CLKSource[1]: CrystalEn to 1 to enable and select
the crystal oscillator. The on-chip crystal oscillator has
load capacitances of 20pF integrated in both XIN and
XOUT. Connect an external crystal or ceramic oscillator
between XIN and XOUT.
When an external clock signal is used, this should
be connected to XIN. Leave XOUT unconnected.
Set CLKSource[4]: ExtClock to 1 and CLKSource[1]:
CrystalEn to 0 to select external clocking.
The internal predivider and PLL allow for a wide range
of external clock frequencies and baud rates. The PLL
can be configured to multiply the input clock rate by a
factor of 6, 48, 96, or 144 through PLLConfig[7:6]. The
predivider, located between the input clock and the PLL,
allows division of the input clock by a factor between 1
and 63 by writing to PLLConfig[5:0]. See the PLLConfig
register description for more information.
The internal fractional baud-rate generator provides a
high degree of flexibility and high resolution in baud-
rate programming. The baud-rate generator has a 16-bit
integer divisor and a 4-bit word for the fractional divisor.
The fractional baud-rate generator can be used either
with the internal oscillator or with the external crystal or
clock source.
and Internal Oscillator
DIVIDER
PLLEn
PLL
Fractional Baud-Rate Generator
PLLByps
GENERATOR
BAUD-RATE
PLL and Predivider
External Clock Source
Crystal Oscillator
17