DS1875T+ Maxim Integrated Products, DS1875T+ Datasheet - Page 66

• Manufacturer Part Number: DS1875T+
• Description: IC SFP CTRLR/TRIPLEXER 38-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of DS1875T+

• Applications: Fiber Optics
• Interface: I²C
• Voltage - Supply: 2.85 V ~ 3.9 V
• Package / Case: *
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PON Triplexer and SFP Controller
Table 02h, Register 89h: CONFIG
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89h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Configure the memory location and the polarity of the digital outputs.
FETG DIR
BITS 2:1
BIT 7
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 0
FETG DIR: Chooses the direction or polarity of the FETG output for normal operation.
0 = (Default) Under normal operation, FETG is pulled low.
1 = Under normal operation, FETG is pulled high.
TX-F LEN: The TX-F output pin always reflects the wired-OR of all TX-F enabled alarm states. This
bit enables the latching of the alarm state for the TX-F output pin.
0 = (Default) Not latched.
1 = The alarm bits are latched until cleared by a TX-D transition or power-down. If the V
enabled for either FETG or TX-F, then latching is disabled until after the first V
made above the V
cycles.
M3QT LEN: This bit enables the latching of the alarm for the M3QT.
0 = (Default) Not latched.
1 = The alarm bit is latched until cleared by setting the M3QT RESET bit (Byte 78h).
ASEL: Address select.
0 = (Default) Device address of A2h.
1 = Device address is equal to the value found in the DEVICE ADDRESS byte (Table 02h, 8Ch).
BOLFS: Bias open-loop full scale.
0 = (Default) Full scale is 600μA.
1 = Full scale is 1.2mA.
RSSI_FC and RSSI_FF: RSSI force coarse and RSSI force fine. Control bits for RSSI mode of
operation on the MON3 conversion.
00b = (Default) Normal RSSI mode of operation.
01b = The fine settings of scale and offset are used for MON3 conversions.
10b = The coarse settings of scale and offset are used for MON3 conversions.
11b = Normal RSSI mode of operation.
EN5TO8B: This bit enables MON5–MON8 conversion (voltage of D0–D3 pins).
0 = (Default) Temperature, V
1 = Temperature, V
TX-F LEN
00h
PW2
PW2
Nonvolatile (SEE)
M3QT LEN
CC
CC
, and MON1–MON4 conversions are enabled.
ALARM LO set point to allow for proper operation during slow power-on
CC
ASEL
, and MON1–MON8 conversions are enabled.
BOLFS
RSSI_FC
RSSI_FF
CC
measurement is
CC
EN5TO8B
BIT 0
alarm is