ds1876 Maxim Integrated Products, Inc., ds1876 Datasheet - Page 12

• Manufacturer Part Number: ds1876
• Description: Sfp Controller With Dual Ldd Interface
• Manufacturer: Maxim Integrated Products, Inc.

SFP Controller with Dual LDD Interface
The DS1876 integrates the control and monitoring func-
tionality required in a dual transmitter system. Key com-
ponents of the DS1876 are shown in the Block Diagram
and described in subsequent sections.
On power-up, the DS1876 sets the DACs to high imped-
ance. After time t
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R
P1
INIT
TOSA2
TOSA1
RC FILTERS
R
(FIGURE 6)
B1
, the DACs are set to an initial condition
Detailed Description
DACs During Power-Up
R
P2
R
B1
BMON
APCIN
APCSET
MODSET
BMON
APCIN
APCSET
MODSET
BMON1
PMON1
BMON2
PMON2
MOD1
MOD2
APC1
APC2
DAC
DAC
DAC
DAC
set in EEPROM. After a temperature conversion is com-
pleted and if the VCC LO alarm is enabled, an additional
V
alarm level is required before the DACs are updated with
the value determined by the temperature conversion and
the DAC LUT.
If a fault is detected, and TXD1 and TXD2 are toggled
to re-enable the outputs, the DS1876 powers up fol-
lowing a similar sequence to an initial power-up. The
CC
LDD2
LDD1
DS1876
EEPROM
QUICK
conversion above the customer-defined VCC LO
TRIP
ADC
TXDOUT1
TXDOUT2
I
DISABLE
DISABLE
2
TXFOUT
C
FAULT
FAULT
TXD1
TXD2
Typical Operating Circuit
TXF1
TXF2
SDA
SCL
TX_FAULT
TX_DISABLE1
TX_DISABLE2
MODE_DEF2 (SDA)
MODE_DEF1 (SCL)