Maxim DS1863 User manual

Maxim > App Notes > DIGITAL POTENTIOMETERS
Keywords: DS1863 May 25, 2007
APPLICATION NOTE 4052
Quick Reference Guide to the DS1863 Memory Map
Abstract: The DS1863 burst-mode PON controller with integrated monitoring capabilities has programming options to
configure the alarms, warnings, lookup tables, and other functions. This programmability necessitates a large register
memory map. This application note provides an outline of the register map, which is convenient when programming
the device.
Memory Map of the DS1863
The DS1863 features six separate memory tables that are internally organized into eight byte rows (Figure 1).
1. The Lower Memory is addressed from 00h to 7Fh. It contains alarm and warning thresholds, flags, masks,
several control registers, password entry area (PWE), and the Table Select byte.
2. Table 01h primarily contains user EEPROM (with PW1 level access) and some alarm and warning status bytes.
3. Table 02h is a multifunction space that contains configuration registers, scaling and offset values, passwords,
interrupt registers, and miscellaneous control bytes.
4. Table 03h is strictly user EEPROM that is protected by a PW2-level password.
5. Table 04h contains a temperature-indexed lookup table (LUT) for controlling the modulation voltage. The
modulation LUT can be programmed in 2°C increments over the -40°C to +102°C range. Access to this register
is protected by a PW2-level password.
6. Table 05h contains another LUT, which allows the APC set point to change as a function of temperature to
compensate for Tracking Error (TE). This TE LUT has 36 entries that determine the APC setting in 4°C windows
between -40°C to +100°C. Access to this register is protected by a PW2-level password.
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Figure 1. Structure of the memory map in the DS1863.
Register Reference
The following tables provide an easy reference to the Lower Memory and Tables 01h and 02h. For a description of
the functionality for each bit, please refer to the corresponding register in the DS1863 data sheet. Tables 03h, 04h, and
05h are lookup tables that do not require a separate reference and, therefore, are not included here.
Note: RSVD is an acronym for RESERVED.
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Lower Memory
Register Name Bit7 Bit0
TEMP ALARM HI 00h S 26252423222120
01h 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8
TEMP ALARM LO 02h S 26252423222120
03h 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8
TEMP WARN HI 04h S 26252423222120
05h 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8
TEMP WARN LO 06h S 26252423222120
07h 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8
VCC ALARM HI 08h 215 214 213 212 211 210 2928
09h 2726252423222120
VCC ALARM LO 0Ah 215 214 213 212 211 210 2928
0Bh 2726252423222120
VCC WARN HI 0Ch 215 214 213 212 211 210 2928
0Dh 2726252423222120
VCC WARN LO 0Eh 215 214 213 212 211 210 2928
0Fh 2726252423222120
MON1 ALARM HI 10h 215 214 213 212 211 210 2928
11h 2726252423222120
MON1 ALARM LO 12h 215 214 213 212 211 210 2928
13h 2726252423222120
MON1 WARN HI 14h 215 214 213 212 211 210 2928
15h 2726252423222120
MON1 WARN LO 16h 215 214 213 212 211 210 2928
17h 2726252423222120
MON2 ALARM HI 18h 215 214 213 212 211 210 2928
19h 2726252423222120
MON2 ALARM LO 1Ah 215 214 213 212 211 210 2928
1Bh 2726252423222120
MON2 WARN HI 1Ch 215 214 213 212 211 210 2928
1Dh 2726252423222120
MON2 WARN LO 1Eh 215 214 213 212 211 210 2928
1Fh 2726252423222120
MON3 ALARM HI 20h 215 214 213 212 211 210 2928
21h 2726252423222120
MON3 ALARM LO 22h 215 214 213 212 211 210 2928
23h 2726252423222120
MON3 WARN HI 24h 215 214 213 212 211 210 2928
25h 2726252423222120
MON3 WARN LO 26h 215 214 213 212 211 210 2928
27h 2726252423222120
SHADOWED EEPROM 28h-2Fh SEE SEE SEE SEE SEE SEE SEE SEE
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PW2 EE 30h-5Fh EE EE EE EE EE EE EE EE
TEMP VALUE 60h S 26252423222120
61h 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8
VCC VALUE 62h 215 214 213 212 211 210 2928
63h 2726252423222120
MON1 VALUE 64h 215 214 213 212 211 210 2928
65h 2726252423222120
MON2 VALUE 66h 215 214 213 212 211 210 2928
67h 2726252423222120
MON3 VALUE 68h 215 214 213 212 211 210 2928
69h 2726252423222120
STATUS 6Eh FETG
STATUS SOFT FETG RSVD TX-F RESET SOFT TX-D TX-F STATUS RSVD RDYB
UPDATE 6Fh TEMP RDY VCC RDY MON1 RDY MON2 RDY MON3 RDY RSVD RSVD RSVD
ALARM370h TEMP HI TEMP LO VCC HI VCC LO MON1 HI MON1 LO MON2 HI MON2 LO
ALARM271h MON3 HI MON3 LO RSVD RSVD RSVD RSVD RSVD RSVD
ALARM172h RSVD RSVD RSVD RSVD BIAS HI RSVD TX-P HI TX-P LO
ALARM073h RSVD RSVD RSVD RSVD BIAS MAX RSVD RSVD RSVD
WARN374h TEMP HI TEMP LO VCC HI VCC LO MON1 HI MON1 LO MON2 HI MON2 LO
WARN275h MON3 HI MON3 LO RSVD RSVD RSVD RSVD RSVD RSVD
PASSWORD ENTRY
(PWE)
7Bh 231 230 229 228 227 226 225 224
7Ch 223 222 221 220 219 218 217 216
7Dh 215 214 213 212 211 210 2928
7Eh 2726252423222120
TABLE SELECT (TBL
SEL) 7Fh 2726252423222120
Table 01h
Bit7 Bit0
PW1 EEPROM 80h-F7h EE EE EE EE EE EE EE EE
ALARM3F8h TEMP HI TEMP LO VCC HI VCC LO MON1 HI MON1 LO MON2 HI MON2 LO
ALARM2F9h MON3 HI MON3 LO RSVD RSVD RSVD RSVD RSVD RSVD
ALARM1FAh RSVD RSVD RSVD RSVD BIAS HI RSVD TX-P HI TX-P LO
ALARM0FBh RSVD RSVD RSVD RSVD BIAS MAX RSVD RSVD RSVD
WARN3FCh TEMP HI TEMP LO VCC HI VCC LO MON1 HI MON1 LO MON2 HI MON2 LO
WARN2FDh MON3 HI MON3 LO RSVD RSVD RSVD RSVD RSVD RSVD
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Table 02h
Bit7 Bit0
MODE 80h SEEB RSVD RSVD RSVD AEN MOD-EN APC-EN BIAS-EN
T INDEX 81h 2726252423222120
MOD DAC 82h 2726252423222120
APC DAC 83h 2726252423222120
BIAS DAC 84h 0 0 212 211 210 292827
85h 2726252423222120
DEVICE ID 86h 0 1 1 0 0 0 1 1
DEVICE VER 87h DEVICE VERSION
UPDATE RATE 86h 0 0 0 0 SR(3:0) SR(3:0) SR(3:0) SR(3:0)
CONFIG 89h FETG DIR TX-F EN RSVD ASEL RSVD RSVD RSVD RSVD
START-UP STEP 8Ah 212 211 210 2928272625
MOD RANGING 8Bh RSVD RSVD RSVD RSVD RSVD MOD2MOD1MOD0
DEVICE ADDRESS 8Ch 27262524232221X
COMP RANGING 8Dh RSVD RSVD RSVD RSVD RSVD APC2APC1APC0
RIGHT SHIFT18Eh RSVD MON1_2 MON1_1 MON1_0 RSVD MON2_2 MON2_1 MON2_0
RIGHT SHIFT08Fh RSVD MON3_2 MON3_1 MON3_0 RSVD RSVD RSVD RSVD
VCC SCALE
MON1-4 SCALE
92, 94,
96, 98,
9Ah 215 214 213 212 211 210 2928
93, 95,
97, 99,
9Bh 2726252423222120
VCC OFFSET
MON1-4 OFFSET
A2, A4,
A6, A8,
AAh S S 215 214 213 212 211 210
A3, A5,
A7, A9,
ABh 2928272625242322
TEMP OFFSET AEh S 28272625242322
AFh 21202-1 2-2 2-3 2-4 2-5 2-6
PW1, PW2
B0h, B4h 231 230 229 228 227 226 225 224
B1h, B5h 223 222 221 220 219 218 217 216
B2h, B6h 215 214 213 212 211 210 2928
B3h, B7h 2726252423222120
FETG ENABLE1B8h TEMP EN VCC EN MON1 EN MON2 EN MON3 EN RSVD RSVD RSVD
FETG ENABLE0B9h TX-P HI EN TX-P LO EN BIAS HI EN BIAS MAX EN RSVD RSVD RSVD RSVD
TX-F ENABLE1BAh TEMP EN VCC EN MON1 EN MON2 EN MON3 EN RSVD RSVD RSVD
TX-F ENABLE0BBh TX-P HI EN TX-P LO EN BIAS HI EN BIAS MAX EN RSVD RSVD RSVD FETG EN
HTXP BCh 2726252423222120
LTXP BDh 2726252423222120
HBIAS BEh 2726252423222120
MAX IBIAS BFh 212 211 210 2928272625
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MAN IBIAS F8h RSVD RSVD 212 211 210 292827
F9h 2726252423222120
MAN_CNTL FAh RSVD RSVD RSVD RSVD RSVD RSVD RSVD MAN_CLK
Application Note 4052: http://www.maxim-ic.com/an4052
More Information
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Related Parts
DS1863: QuickView -- Full (PDF) Data Sheet -- Free Samples
AN4052, AN 4052, APP4052, Appnote4052, Appnote 4052
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