SML2108 View Datasheet(PDF) - Summit Microelectronics
Part Name
Description
MFG CO.
'SML2108' PDF : 21 Pages View PDF
PIN CONFIGURATION
48-Pin TQFP
SML2108
PRELIMINARY
A0 1
A1 2
A2 3
SDA 4
SCL 5
AUTOMON 6
RDY# 7
ALERT# 8
EXT TEMP 9
CAP2 10
CAP1 11
DETECT 12
36 MODN
35 MODN
34 BIASN
33 BIASN
32 VSS
31 VSS
30 VSS
29 VSS
28 BIASN
27 BIASN
26 MODN
25 MODN
2053 PCon 2.0
PIN DESCRIPTIONS
DETECT (12)
This is the analog input from the laser monitor photodiode
for the integrator circuit. There is an on-board resistance
of 2MΩ between the DETECT input and CAP1 pin.
CAP1 and CAP2 (11 & 10)
Capacitor inputs for an external capacitor in the feedback
loop of the Mean Power Control Integrator. There is an on-
board capacitance of 500pF.
AUTOMON (6)
Active high input used to enable the internal auto-monitor
function, which provides automatic adjustments to the
modulation output currents (MODP and MODN) based on
the internal A/D output and the values stored in the
nonvolatile lookup table. This pin has an internal 100kΩ
pullup.
ALERT# (8)
Active low, open-drain output. This pin is driven low
whenever the bias current increases beyond a predefined
nonvolatile threshold. This can be used to predict laser
failure.
SDA, SCL (4 & 5)
Data and Clock lines, respectively, whose function and
use are based on the industry standard I2C interface.
Lookup table values, configuration data, and D/A and A/D
registers may all be accessed via these two pins of the
SML2108. These pins have internal 100kΩ pullups.
A0, A1, A2 (1, 2, & 3)
Address Pins for the interface provided to allow multiple
devices on a single bus. These pins have internal 100kΩ
pullups.
RDY# (7)
Active low, open-drain output. This pin is driven low
whenever the internal A/D is performing a conversion, or
while the on-board EEPROM is being programmed.
EXT TEMP (9)
Temperature input (or no connection). This pin can be
programmed as an input to the ADC and can interface a
temperature sensor. The EXT TEMP pin is multiplexed
with the bias current to provide a means of configuring the
input to the ADC. When EXT TEMP is programmed as the
SUMMIT MICROELECTRONICS, Inc.
2053 2.2 11/07/00
3
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