参数资料
型号: STR912FAW44X6T
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: 97/100页
文件大小: 1801K
代理商: STR912FAW44X6T
Package mechanical data
STR91xFAxxx
Figure 43.
Recommended PCB design rules (0.80/0.75 mm pitch BGA)
9.1
ECOPACK
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.
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,
ΘJA 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 500 mW (IDD x VDD, or 250 mA x
2.0 V).
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.
Dpad
Dsm
Dpad
0.37 mm
Dsm
0.52 mm typ. (depends on solder
mask registration tolerance
Solder paste
0.37 mm aperture diameter
– Non solder mask defined pads are recommended
– 4 to 6 mils screen print
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