DSP56156ROM datasheet(67/76 Pages) MOTOROLA

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Design Considerations

DSP56156 Data Sheet

MOTOROLA

Power Consumption

(VCC = 5.0 V dc ± 10%, TJ = -40° to +125°C, CL = 50 pF + 1 TTL Load)

The DC electrical characteristics of this device are shown in Table 27. Power consumption is

application dependant. The data in Table 27 is collected by running the following code using

internal memory after having programmed all pins of port B and C as input and after having

three-stated the data bus (MC = 0 in OMR) and pulled high:

move

#0,r0

move

#0,r3

move

#$100,r2

move

#$00ff,m0

loop

clr

move

x:(r0)+,a

;initial value to accumulator

move

a1,a0

rep

#30

mac

x0,y0,a

x:(r3)+,x0

;mac on typical data

move

a,p:(r2)

;store the mac result

move

#0,r3

jmp

loop

To minimize the power dissipation, all unused digital input pins should be tied inactive to

ground or power; and all unused I/O pins should be tied inactive through a 10K¾ resistor to

ground or power. When the codec is not used, GNDA should be connected to GND; and VCCA

should be connected to VCC. Also, all codec pins should be left floating, except VREF which

should still be decoupled.

Table 27 DC Electrical Characteristics

Conditions

Symbol

Typical

Unit

MHz

Digital current with Codec and PLL disabled

ICC

112

133

Digital current Wait Mode with Codec

and PLL disabled

ICC

Digital current Wait Mode with Codec Enabled

and PLL disabled

ICC

113

134

Stop mode with PLL and CLKO disabled

ICC

—

250

—

µA

Digital current drawn by the PLL when active

ICC

—1—

Digital current drawn by CLKO when active

ICC

—3.6

—

Analog current with Codec enabled

ICCA

—12—

Analog current with Codec disabled

ICCA

—70—

µA

Power Consumption

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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