DS1852

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)


Specifications

Voltage on Any Pin Relative to Ground .............................-0.3V to +6.0V
Operating Temperature Range.................................. -40°C to +125°C
Programming Temperature Range ...................................0°C to +70°C
Storage Temperature Range ......................................-55°C to +125°C
Soldering Temperature.............................. .See J-STD-020A specification
*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.


Description

The DS1852 transceiver monitor manages all system monitoring functions in a fiber optic data transceiver module, in accordance with proposal SFF-8472. DS1852's 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 temperaturecompensated programmability. The temperature dependencies of the trip points aid in assessing critical conditions.