AM29245EH datasheet(33/36 Pages) AMD

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P R E L I M I N A R Y

Am29240 EH Microcontroller Series

™

SWITCHING TEST CIRCUIT

Am29240EH Microcontroller

IOL = 3.2 mA *

VREF = 1.5 V

IOH = 400 µA *

Pin Under Test

Note:

*All outputs except MEMCLK. MEMCLK is tested with IOL= 20 mA and IOH= –20mA.

THERMAL CHARACTERISTICS

The Am29240EH microcontroller series is specified for

operation with case temperature ranges for a commercial

temperature device. Case temperature is measured at

the top center of the PQFP package as shown in Figure

13.

θJA

θCA

θJC

θJA = θJC + θCA

Figure 13. Thermal Resistance —

°C/Watt

The various temperatures and thermal resistances can

be determined using the equations shown in Figure 14

along with information given in Table 2. (The variable

is power in watts.)

θJA = θJC + θCA

P=ICCOP

⋅ freq ⋅ V

TJ =TC +P

⋅ θ

TJ =TA +P

⋅ θ

TC =TJ –P

⋅ θ

TC =TA +P

⋅ θ

TA =TJ –P

⋅ θ

TA =TC –P

⋅ θ

Figure 14. Thermal Characteristics Equations

Table 2. Thermal Characteristics (

°C/Watt) Surface Mounted

Parameter

°C/Watt

Junction-to-Ambient

Junction-to-Case

Case-to-Ambient

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