DS1876T+T&R Maxim Integrated Products, DS1876T+T&R Datasheet - Page 23

• Manufacturer Part Number: DS1876T+T&R
• Description: IC CTRLR SFP DUAL LDD 28TQFN
• Manufacturer: Maxim Integrated Products
• Type: SFP Laser Controllerr

Specifications of DS1876T+T&R

• Input Type: Logic
• Output Type: Logic
• Interface: I²C
• Current - Supply: 10mA
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 14. Memory Map
Auxiliary Memory (Device A0h) contains 256 bytes
of EE memory accessible from address 00h–FFh. It is
selected with the device address of A0h.
See the Register Descriptions section for a more com-
plete detail of each byte’s function, as well as for read/
write permissions for each byte.
Many nonvolatile memory locations (listed within the
Register Descriptions section) are actually shadowed
EEPROM and are controlled by the SEEB bit in Table
02h, Register 80h.
The DS1876 incorporates shadowed EEPROM memory
locations for key memory addresses that can be writ-
ten many times. By default the shadowed EEPROM bit,
00h
I
2
C ADDRESS A0h
(256 BYTES)
EEPROM
______________________________________________________________________________________
FFh
SFP Controller with Dual LDD Interface
00h
80h
F8h
I
2
C ADDRESS A2h/B2h
PASSWORD ENTRY
(PWE) (4 BYTES)
TABLE-SELECT
(A2h ONLY)
ENABLE ROW
(120 BYTES)
TABLE 01h
Shadowed EEPROM
MEMORY
(8 BYTES)
LOWER
EEPROM
ALARM-
BYTE
7Fh
FFh
F7h
80h
(B2h ONLY CONTAINS
RELATED REGISTERS)
NOTE 1: IF ASEL = 0, THEN THE MAIN DEVICE I
NOTE 2: TABLE 00h DOES NOT EXIST.
NOTE 3: ALARM-ENABLE ROW CAN BE CONFIGURED TO EXIST AT TABLE 01h OR TABLE 05h USING THE
TABLE CONTROL
CONFIGURATION
TRANSMITTER 2-
NONLOOKUP
TABLE 02h
REGISTERS
AND
IF ASEL = 1, THEN THE MAIN DEVICE I
TABLE 02h, REGISTER 8Bh.
MASK BIT IN TABLE 02h, REGISTER 88h.
FFh
80h
F8h
SEEB, is not set and these locations act as ordinary
EEPROM. By setting SEEB, these locations function
like SRAM cells, which allow an infinite number of write
cycles without concern of wearing out the EEPROM.
This also eliminates the requirement for the EEPROM
write time, t
enabled do not affect the EEPROM, these changes are
not retained through power cycles. The power-on value
is the last value written with SEEB disabled. This func-
tion can be used to limit the number of EEPROM writes
during calibration or to change the monitor thresholds
periodically during normal operation helping to reduce
the number of times EEPROM is written. Figure 14 shows
the memory map and indicates which locations are
shadowed EEPROM.
LOOKUP TABLE
OFFSET LUT
TABLE 04h
MOD1 (A2h)
MOD2 (B2h)
(72 BYTES)
MOD1/2
FFh
C7h
WR
2
2
C SLAVE ADDRESS IS A2h/B2h.
C SLAVE ADDRESS IS DETERMINED BY THE VALUE IN
. Because changes made with SEEB
ALARM-ENABLE ROW
CAN BE CONFIGURED
TO EXIST AT TABLE 01h
OR TABLE 05h USING
MASK BIT IN TABLE 02h,
REGISTER 88h.
F8h TABLE 05h
ALARM-ENABLE ROW
(8 BYTES)
FFh
80h
E0h
TXP HI 1/2, TXP LO 1/2)
(APC1/2, HBATH1/2,
LOOKUP TABLE
OFFSET LUT
TABLE 06h
APC1 (A2h)
APC2 (B2h)
(72 BYTES)
FFh
C7h
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