EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 43

• Manufacturer Part Number: EMC2303-1-KP-TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of EMC2303-1-KP-TR

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 12
• Lead Free Status / RoHS Status: Compliant

ADDR
EFh
ADDRESS
Multiple RPM-Based PWM Fan Controller for Three Fans
Datasheet
FCh
SMSC EMC2303
5.19
5.20
R/W
R/W
RPM
R/W
R
The Software Lock Register controls the software locking of critical registers. This register is software
locked.
Bit 0 - LOCK - this bit acts on all registers that are designated SWL. When this bit is set, the locked
registers become read only and cannot be updated.
The Product Features register shows those functions that are enabled by external pin states.
Bits 5-3 - ADR[2:0] - Indicates the selected SMBus address as determined by the ADDR_SEL pin.
Software Lock Register
Product Features Register
REGISTER
Software
‘0’ (default) - all SWL registers can be updated normally.
‘1’ - all SWL registers cannot be updated and a hard-reset is required to unlock them.
=
Lock
------------------- -
(
poles
REGISTER
RPM
Features
1
Product
)
×
=
--------------------------------- -
COUNT
3,932,160 m
------------------------------------- -
B7
-
(
COUNT
n 1
–
Table 5.30 Product Features Register
Table 5.29 Software Lock Register
B7
)
×
-
---- -
m
1
×
B6
-
×
f
TACH
B6
DATASHEET
-
×
B5
-
60
43
B5
ADR[2:0]
B4
-
B4
poles = number of poles of the fan
COUNT = TACH Reading Register
measurement frequency (typically
m = the multiplier defined by the
n = number of edges measured
B3
(typically 5 for a 2 pole fan)
-
B3
f
TACH
value (in decimal)
RANGE bits
(typically 2)
32.768kHz)
= the tachometer
B2
B2
-
where:
FAN_SPD [2:0]
B1
B1
-
Revision 1.2 (03-22-10)
B0
LOCK
B0
DEFAULT
[2]
[3]
DEFAULT
00h
00h