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參數資料
| 型號： | MCIMX281AVM4B |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 454 MHz, RISC PROCESSOR, PBGA289 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-289 |
| 文件頁數： | 10/72頁 |
| 文件大?。?/td> | 915K |
| 代理商： | MCIMX281AVM4B |
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i.MX28 Applications Processors Data Sheet for Automotive Products, Rev. 1
18
Freescale Semiconductor
3.1.6
Supply Power-Up/Power-Down Requirements
There is no special power-up sequence. After applying 5 V or battery in any order, the rest of the power
supplies are internally generated and automatically come up in a safe way.
There is no special power-down sequence. 5 V or the battery can be removed at any time.
3.1.7
Reset Timing
Because the i.MX28 is a PMU and an SoC, power-on reset is generated internally and there is no timing
requirement on external pins.
The i.MX28 can be reset by asserting the external pin RESETN for at least 100 mS and later deasserting
RESETN.
If the reset occurs while the device is only powered by the battery, then the reset kills all of the power
supplies and the system reboots on the assertion of PSWITCH. If auto-restart is set up ahead of time, the
system reboots immediately.
If the chip is powered by 5 V, then the reset serves to reset the digital sections of the chip. If the DCDC is
operating at the time of the reset, then power switches back to the default linear regulators powered by 5 V.
Figure 2. RESETN Timing
3.2
Thermal Characteristics
The thermal resistance characteristics for the device are given in Table 22. These values are measured
under the following conditions:
Two layer Substrate
Substrate solder mask thickness: 0.025 mm
Substrate metal thicknesses: 0.016 mm
Substrate core thickness: 0.160 mm
OSC32K
On
DCDC
Off
On
RTC
On
Other Modules
Off
On/Off
Table 21. Power Mode Settings (continued)
Core/Clock/Module
Deep-Sleep
Standby
Run
RESETN
At least 100ms
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