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| 型号： | MPC853TZT50 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 50 MHz, RISC PROCESSOR, PBGA256 |
| 封装： | PLASTIC, BGA-256 |
| 文件页数： | 3/88页 |
| 文件大小： | 1185K |
| 代理商： | MPC853TZT50 |
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MPC853T Hardware Specification, Rev. 1
Freescale Semiconductor
11
Power Supply and Power Sequencing
7.5 Experimental Determination
To determine the junction temperature of the device in the application after prototypes are available, the thermal
characterization parameter (
ΨJT) can be used. It determines the junction temperature with a measurement of the
temperature at the top center of the package case using the following equation:
TJ = TT + (ΨJT × PD)
where:
Ψ
JT = thermal characterization parameter
TT = thermocouple temperature on top of package
PD = power dissipation in package
The thermal characterization parameter is measured per the JESD51-2 specification published by JEDEC using a 40
gauge type T thermocouple epoxied to the top center of the package case. The thermocouple should be positioned
so that the thermocouple junction rests on the package. A small amount of epoxy is placed over the thermocouple
junction and over about 1 mm of wire extending from the junction. The thermocouple wire is placed flat against the
package case to avoid measurement errors caused by cooling effects of the thermocouple wire.
8
Power Supply and Power Sequencing
This section provides design considerations for the MPC853T power supply. The MPC853T has a core voltage
(VDDL) and PLL voltage (VDDSYN), which both operate at lower voltages than the I/O voltage VDDH. The I/O
section of the MPC853T is supplied with 3.3 V across VDDH and VSS (GND).
The signals PA[0:3], PA[8:11], PB15, PB[24:25]; PB[28:31], PC[4:7], PC[12:13], PC15] PD[3:15], TDI, TDO,
TCK, TRST, TMS, MII_TXEN, and MII_MDIO are 5-V tolerant. All inputs cannot be more than 2.5 V greater than
VDDH. In addition, 5-V tolerant pins can not exceed 5.5 V, and remaining input pins cannot exceed 3.465 V. This
restriction applies to power up/down and normal operation.
One consequence of multiple power supplies is that when power is initially applied, the voltage rails ramp up at
different rates. The rates depend on the nature of the power supply, the type of load on each power supply, and the
manner in which different voltages are derived. The following restrictions apply:
VDDL must not exceed VDDH during power up and power down.
VDDL must not exceed 1.9 V, and VDDH must not exceed 3.465 V.
These cautions are necessary for the long-term reliability of the part. If they are violated, the electrostatic discharge
(ESD) protection diodes are forward-biased, and excessive current can flow through these diodes. If the system
power supply design does not control the voltage sequencing, the circuit shown in Figure 2 can be added to meet
these requirements. The MUR420 Schottky diodes control the maximum potential difference between the external
bus and core power supplies on power up and the 1N5820 diodes regulate the maximum potential difference on
power down.
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| MPC8540ADS-BGAE | 功能描述:开发板和工具包 - 其他处理器 ADS BOARD- 8540 RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| MPC8540CPX667JB | 功能描述:微处理器 - MPU PQ 3 8540-DRACOM RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8540CPX667JC | 功能描述:数字信号处理器和控制器 - DSP, DSC PQ37 Exented Temp RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
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