DESCRIPTION
The DS1852 transceiver monitor manages all system monitoring functions in a fiber optic data transceiver module, in accordance with proposal SFF-8472. Its functions include 2-wire communications with the host system, EEPROM memory for identification, tracking, and calibration, an ADC with four muxing inputs, three fast comparators, and a temperature sensor to monitor an optical transceiver. The DS1852 has programmable alarm and warning flags for all four analog-to-digital (A/D) conversion values (three user analog inputs plus supply voltage) as well as the temperature. These conditions can be used to determine critical parameters inside each module. The three fast comparators have temperature-compensated programmability. The temperature dependencies of the trip points aid in assessing critical conditions.

FEATURES
■ Implements proposals of SFF-8472 at device address A2h
    [Note: requires use of external EEPROM at address A0h for full compliance.]
■ Scaleable four-input muxing analog-to-digital converter (ADC)
■ Direct-to-digital temperature converter
■ Programmable alarm and warning conditions
■ Temperature-compensated, programmable three-input muxing fast comparator
■ Access temperature, data, and device control through a 2-wire interface
■ Operates from 3V or 5V supplies
■ Packaging: 25-ball BGA
■ Operating temperature: -40°C to +100°C
■ Programming temperature: 0°C to +70°C
■ Three levels of security
■ 127 bytes EEPROM for security level 1
■ 128 bytes EEPROM for security level 2
■ Address space is GBIC compliant (with use of external EEPROM at device address A0h)