参数资料
型号: STR912FAW46X6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 96 MHz, RISC MICROCONTROLLER, PQFP128
封装: 14 X 14 MM, 0.40 MM PITCH, ROHS COMPLIANT, PLASTIC, LQFP-128
文件页数: 100/101页
文件大小: 1922K
代理商: STR912FAW46X6
Package mechanical data
STR91xFAxxx
9.2
Thermal characteristics
The average chip-junction temperature, TJ must never exceed 125° C.
The average chip-junction temperature, TJ, in degrees Celsius, may be calculated using the
following equation:
TJ = TA + (PD x ΘJA)(1)
Where:
–TA is the Ambient Temperature in °C,
Θ
JA is the Package Junction-to-Ambient Thermal Resistance, in ° C/W,
–PD is the sum of PINT and PI/O (PD = PINT + PI/O),
–PINT is the product of IDD and VDD, expressed in Watts. This is the Chip
Internal Power.
PI/O represents the Power Dissipation on Input and Output Pins;
Most of the time for the applications PI/O< PINT and may be neglected. On the other hand,
PI/O may be significant if the device is configured to drive continuously external modules
and/or memories. The worst case PINT of the STR91xFA is 500mW (IDD x VDD, or 250mA x
2.0V).
An approximate relationship between PD and TJ (if PI/O is neglected) is given by:
PD = K / (TJ + 273°C) (2)
Therefore (solving equations 1 and 2):
K = PD x (TA + 273°C) + ΘJA x PD
2(3)
where:
K is a constant for the particular part, which may be determined from
equation (3) by measuring PD (at equilibrium) for a known TA. Using this
value of K, the values of PD and TJ may be obtained by solving
equations (1) and (2) iteratively for any value of TA.
Table 50.
Thermal characteristics
Symbol
Parameter
Value
Unit
Θ
JA
Thermal Resistance Junction-Ambient
LQFP 80 - 12 x 12 mm / 0.5 mm pitch
41.5
°C/W
Θ
JA
Thermal Resistance Junction-Ambient
LQFP128 - 14 x 14 mm / 0.4 mm pitch
38
°C/W
Θ
JA
Thermal Resistance Junction-Ambient
LFBGA 144 - 10 x 10 x 1.7mm
36.5
°C/W
相关PDF资料
PDF描述
STR912FW42X6 32-BIT, FLASH, 96 MHz, RISC MICROCONTROLLER, PQFP128
STW0Q14A SINGLE COLOR LED, WHITE
STW0Q2PA SINGLE COLOR LED, WHITE
STW1145LTM SINGLE COLOR LED, WHITE, 1.9 mm
STW8T16A SINGLE COLOR LED, WHITE
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