EMC2101-ACZL SMSC, EMC2101-ACZL Datasheet - Page 44

• Manufacturer Part Number: EMC2101-ACZL
• Description: Industrial Temperature Sensors Sngl Fan Contrllr
• Manufacturer: SMSC

Specifications of EMC2101-ACZL

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

APPLICATION NOTE: The output of the DAC driver is dependent upon the current load. With a low current load,
Revision 2.54 (06-16-09)
6.19
6.20
ADDR.
ADDR.
4Dh
4Eh
R/W
R/W
R/W
R/W
The register applies to the fan driver in both PWM and DAC operating modes. The DAC output is
determined by equation
These values are independent of the POLARITY bit (see
the Fan Setting Register will always refer to minimum output drive while a setting of 3Fh in the Fan
Setting Register will always refer to maximum output drive.
The PWM Frequency Register determines the final PWM frequency and “effective resolution” of the
PWM driver. It has no affect on the DAC output resolution.
It is recommended that this register be set at 1Fh for maximum resolution. See
PWM Options"
and Duty Cycle.
This register holds an alternate PWM Frequency divide value that can be used instead of the CLK_SEL
bit function. This register can be written at any time, however unless the CLK_OVR bit is set to a logic
‘1’, it is not used.
When the CLK_OVR bit is set to a logic ‘1’, the PWM Frequency Divide Register is used in conjunction
with the PWM Frequency Register to determine the final PWM frequency that the load will see. When
the CLK_OVR bit is set to a logic ‘0’, the setting of this register is not changed and is not used to
determine the effective PWM frequency.
The PWM frequency when the PWM Frequency Divide Register is used is shown in
PWM Frequency Register
PWM Frequency Divide Register
PWM Frequency
PWM Frequency
the output will be from 0V to an LSB (approximately 52mV at V
a maximum of 64 linear steps.
REGISTER
REGISTER
Divide
for full operation of the PWM_F register and its interactions with the PWM Resolution
Table 6.25 PWM Frequency Divide Register
FAN
[4]
Table 6.24 PWM Frequency Register
below.
=
B7
B7
-
⎛
⎝
FAN _ SETTING
--------------------------------------------
DATASHEET
B6
B6
-
64
44
B5
B5
-
SMBus Fan Control with 1°C Accurate Temperature Monitoring
⎞
⎠
×
PWM_D[7:0]
B4
V
B4
DD
B3
Section
B3
PWM_F[4:0]
B2
6.16). Therefore, a value of 00h in
B2
B1
DD
B1
= 3.3V) below V
Appendix A "Advanced
B0
B0
Equation
SMSC EMC2101
DEFAULT
DEFAULT
Datasheet
01h
17h
DD
[5].
[4]
with