dspb56011 Freescale Semiconductor, Inc, dspb56011 Datasheet - Page 76
dspb56011
Manufacturer Part Number
dspb56011
Description
24-bit Dvd Digital Signal Processor
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.DSPB56011.pdf
(82 pages)
- Current page: 76 of 82
- Download datasheet (323Kb)
Design Considerations
Power Consumption Considerations
POWER CONSUMPTION CONSIDERATIONS
4-4
For an I/O pin loaded with 50 pF capacitance, operating at 5.5 V, and with a 81 MHz clock, toggling
at its maximum possible rate (20 MHz), the current consumption is:
Equation 3:
Power dissipation is a key issue in portable DSP applications. Some of the factors
which affect current consumption are described in this section. Most of the current
consumed by CMOS devices is Alternating Current (AC), which is charging and
discharging the capacitances of the pins and internal nodes.
Current consumption is described by the formula:
where:
The Maximum Internal Current (I
switching of the internal buses on best-case operation conditions, which is not
necessarily a real application case. The Typical Internal Current (I
reflects the average switching of the internal buses on typical operating conditions.
For applications that require very low current consumption:
Equation 4:
•
•
•
•
•
Minimize the number of pins that are switching.
Minimize the capacitive load on the pins.
Connect the unused inputs to pull-up or pull-down resistors.
Disable unused peripherals.
Disable unused pin activity.
C = node/pin capacitance
V = voltage swing
f = frequency of node/pin toggle
I
=
DSP56011 Technical Data Sheet, Rev. 1
C V f
I
=
Example 4-1 Current Consumption
50 10
Preliminary Information
–
12
5.5 20 10
CCI
max) value reflects the typical possible
6
=
5.5mA
CCItyp
MOTOROLA
) value
Related parts for dspb56011
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
TTLPWG Series FAST / TTL Pulse Width Generator Modules
Manufacturer:
RHOMBUS-IND [Rhombus Industries Inc.]
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Dsp Microcomputer
Manufacturer:
Analog Devices, Inc.
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet: