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參數(shù)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(shù)： | 14/72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
Freescale Semiconductor
21
Table 25 shows the external devices supported by the EMI.
3.3.2
GPIO I/O DC Parameters
Max load includes capacitive load due to PCB traces, pad capacitance and driver self-loading. For the
internal pull up setting of each pad, see the “Pin Control and GPIO” section of the reference manual.
Table 26 shows the digital pin DC characteristics for GPIO in 3.3-V mode. Measurements are valid for
eight pins loaded using the 4mA driver, four pins loaded using the 8mA driver, and two pins loaded using
either the 12mA or 16mA driver.
Table 25. External Devices Supported by the EMI
DRAM Device
Max Load1, 2
1 Max load includes capacitive load due to PCB traces, pad capacitance and driver self-loading.
2 Setting is for worst case. Freescale’s EMI interface uses less powerful drivers than those typically used in mDDR devices. A
possible transmission-line effect on the PC board must be suppressed by minimizing the trace length combined with
Freescale’s slower edge-rate drivers. The i.MX28 provides up to 16 mA programmable drive strength. However, the 16-mA
mode is an experimental mode. With the 16-mA mode, the EMI function may be impaired by Simultaneous Switching Output
(SSO) noise. In general, the stronger the driver mode, the noisier the on-chip power supply. Freescale recommends not using
a stronger driver mode than is required. Because on-chip power and ground noise is proportional to the inductance of its return
path, users should make their best effort to reduce inductance between the EMI power and ground balls and the PC board
power and ground planes.
Pad Voltage
DDR2
15 pF
1.8 V
mDDR
15 pF
1.8 V
LVDDR2
15 pF
1.5 V
Table 26. Digital Pin DC Characteristics for GPIO in 3.3-V Mode
Parameter
Symbol
Min
Max
Units
Input voltage high (dc)
VIH
2
VDDIO
V
Input voltage low (dc)
VIL
—
0.8
V
Output voltage high (dc)
VOH
0.8
× VDDIO
—
V
Output voltage low (dc)
VOL
—
0.4
V
Output source current1 (dc)
gpio
IOH – Low
-5.0
—
mA
IOH – Medium
-9.5
—
mA
IOH – High
-11.4
—
mA
Output sink current1 (dc)
gpio
IOL – Low
3.8
—
mA
IOL – Medium
7.7
—
mA
IOL – High
9.0
—
mA
Output source current1 (dc)
gpio_clk
IOH – Low
-9.2
—
mA
IOH – High
-15.2
—
mA
Output sink current1 (dc)
gpio_clk
IOL – Low
7.6
—
mA
IOL – High
12.0
—
mA
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