Datasheet

Dual Serial UART with 128-Word FIFOs
MAX3109
3Maxim Integrated
FIFO Interrupt Triggering......................................................................26
Low-Power Standby Modes
...................................................................26
Forced-Sleep Mode
.......................................................................26
Auto-Sleep Mode
.........................................................................26
Multiple UARTs in Sleep Mode
..............................................................26
Shutdown Mode
..........................................................................27
Power-Up and IRQ
..........................................................................27
Interrupt Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Interrupt Enabling
.........................................................................27
Interrupt Clearing
.........................................................................27
Register Map
................................................................................ 28
Detailed Register Descriptions
...................................................................29
Serial Controller Interface
....................................................................... 57
SPI Interface
...............................................................................57
SPI Single-Cycle Access
...................................................................57
SPI Burst Access
.........................................................................58
Fast Read Cycle
..........................................................................58
I
2
C Interface ...............................................................................58
START, STOP, and Repeated START Conditions
.................................................58
Slave Address
...........................................................................59
Bit Transfer
..............................................................................59
Single-Byte Write
.........................................................................60
Burst Write
..............................................................................60
Single-Byte Read
.........................................................................61
Burst Read
..............................................................................61
Acknowledge Bits
........................................................................62
Applications Information
........................................................................ 62
Startup and Initialization
......................................................................62
Low-Power Operation
........................................................................63
Interrupts and Polling
........................................................................63
Logic-Level Translation
.......................................................................63
Power-Supply Sequencing
....................................................................64
Connector Sharing
..........................................................................64
RS-232 5x3 Application
......................................................................64
Typical Application Circuit
......................................................................65
Chip Information
.............................................................................. 65
Package Information
........................................................................... 65
Revision History
.............................................................................. 66
TABLE OF CONTENTS (continued)