Micrel, Inc.
MIC3003
Serial Interface Address Maps
Address
Field Size Name
Description
(Decimal)
(Bytes)
0 –95
96
Serial ID defined by SFP MSA
General-purpose NVRAM; R/W under valid OEM password.
Vendor specific EEPROM
96 – 127
128 – 255
32
Vendor Specific
Reserved
128
Reserved for future use. General-purpose NVRAM; R/W under
valid OEM password.
Table 1. MIC3003 Serial Interface Address Map, Device Address = A0h
Address(s)
Field Size
(Bytes)
Hex
Dec
Name
Description
00-27
0-39
40
Alarm and Warning Thresholds
High/low limits for warnings and alarms; writeable using the
OEM password; read-only otherwise.
28-37
38-5B
40-55
56-91
16
36
Reserved
Reserved – do not write; reads undefined.
Calibration Constants
Numerical constants for external calibration; writeable using
the OEM password; read-only otherwise.
5C-5E
5F
92-94
95
3
1
Reserved
Reserved – do not write; reads undefined.
Checksum
General-purpose NVRAM; writeable using the OEM password;
read-only otherwise.
60-69
6A-6D
6E
96-105
106-109
110
10
4
Analog Data
Real time analog parameter data.
Reserved – do not write; reads undefined.
Control and status bits.
Reserved
1
Control/Status Register
Rate Select Control
6F
111
1
Bits [7-6] control the use of the RS0 and RS1 inputs and the
SRS0 and SRS1 register bits.
70-71
72-73
74-75
76
112-113
114-115
116-117
118
2
2
2
1
Alarm Flags
Reserved
Alarm status bits; read-only.
Reserved – do not write; reads undefined.
Warning status bits; read-only.
Additional control and status bits.
Warning Flags
Extended Control/Status
Register
77
119
1
7
Reserved
OEMPW
Reserved – do not write; reads undefined.
78-7E
120-126
OEM password entry field. The four-byte OEM password
location can be selected to be 78h-7Bh (120-123) by setting
OEMCFG5 bit 2 to 0 (default) or 7Bh-7Eh (123-126) by setting
OEMCFG5 bit 2 to a one.
7F
127
1
Vendor-specific
User Scratchpad
Alarms Masks
Vendor specific. Reserved – do not write; reads undefined.
User-writeable EEPROM. General-purpose NVRAM.
Bit = 0: Corresponding alarm not masked.
Bit = 1: Corresponding alarm masked.
80-F7
F8-F9
128-247 120
248-249
2
FA-FB
250-251
2
Warnings Masks
Bit = 0: Corresponding warning not masked.
Bit = 1: Corresponding warning masked.
Reserved – do not write; reads undefined.
End-user control and status bits.
FC-FD 252-253
2
1
1
Reserved
USRCTL
FE
FF
254
255
RESETOUT
Bits [2:0] of this register control the QGPO reset output (pin
17) If OEMCFG3 bit 7 is set to 1.
Table 2. MIC3003 Serial Interface Address Map, Device Address = A2
15
M9999-111209-C
hbwhelp@micrel.com or (408) 955-1690
November 2009
MICREL [ MICREL SEMICONDUCTOR ]
