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General Description

The DS1877 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The device supports all LOS functions for two receivers, and continually monitors for LOS of either channel. Four ADC channels monitor VCC, temperature, and two differential external monitor inputs that can be used to meet all monitoring requirements. Two digitalto-analog converter (DAC) outputs with temperatureindexed lookup tables (LUTs) are available for additional monitoring and control functionality.

Features

◆ Meets All SFF-8472 Control and Monitoring Requirements

◆ Four Analog Monitor Channels: Temperature, VCC, RSSI1, RSSI2 RSSI1 and RSSI2 Support Internal and External Calibration Differential Input Common-Mode Range from GND to VCC Scalable Dynamic Range Internal Direct-to-Digital Temperature Sensor Alarm and Warning Flags for All Monitored Channels

◆ Two 10-Bit Delta-Sigma Outputs Each Controlled by 72-Entry Temperature LUT

◆ Digital I/O Pins: Four Inputs, Four Outputs

◆ Comprehensive Loss-of-Signal (LOS) Detection em

◆ Flexible, Two-Level Password Scheme Provides Three Levels of Security

◆ 120 Bytes of Password-1 Protected Memory

◆ 128 Bytes of Password-2 Protected Memory in Main Device Address

◆ 256 Additional Bytes Located at A0h Slave Address

◆ Receiver 1 is Accessed at A2h Slave Address

◆ Receiver 2 is Accessed at B2h Slave Address

◆ I2C-Compatible Interface

◆ +2.85V to +3.9V Operating Voltage Range

◆ -40NC to +95NC Operating Temperature Range

◆ 28-Pin TQFN (5mm x 5mm x 0.75mm) Package

Applications

??? SFF, SFP, and SFP+ Transceiver Modules

??? Dual Rx Video SFPs