參數(shù)資料
型號： MAC7121MAG50
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： Microcontroller Family Hardware Specifications
中文描述： 微控制器系列硬件規(guī)格
文件頁數(shù)： 11/56頁
文件大?。?/td> 471K
代理商： MAC7121MAG50
Electrical Characteristics
MAC7100 Microcontroller Family Hardware Specifications, Rev. 1.2
Preliminary
Freescale Semiconductor
11
3.7
Power Supply
The MAC71xx Family utilizes several pins to supply power to the oscillator, PLL, digital core, I/O ports
and ATD. In the context of this section, V
DD
5 is used for V
DD
A, V
DD
R or V
DD
X; V
SS
5 is used for V
SS
A,
V
SS
R or V
SS
X unless otherwise noted. I
DD
5 denotes the sum of the currents flowing into the V
DD
A,
V
DD
X, and V
DD
R. V
DD
is used for V
DD
2.5, and V
DD
PLL, V
SS
is used for V
SS
2.5 and V
SS
PLL. I
DD
is
used for the sum of the currents flowing into V
DD
2.5 and V
DD
PLL.
3.7.1
Current Injection
The power supply must maintain regulation within the V
DD
5 or V
DD
2.5 operating range during
instantaneous and operating maximum current conditions. If positive injection current (V
in
> V
DD
5) is
greater than I
DD
5, the injection current may flow out of V
DD
5 and could result in the external power supply
going out of regulation. It is important to ensure that the external V
DD
5 load will shunt current greater than
the maximum injection current. The greatest risk will be when the MCU is consuming very little power
(for example, if no system clock is present, or if the clock rate is very low).
3.7.2
Power Supply Pins
The V
DD
R – V
SS
R pair supplies the internal voltage regulator. The V
DD
A – V
SS
A pair supplies the A/D
converter and the reference circuit of the internal voltage regulator. The V
DD
X – V
SS
X pair supplies the
I/O pins. V
DD
PLL – V
SS
PLL pair supplies the oscillator and PLL.
All V
DD
X pins are internally connected by metal. All V
SS
X pins are internally connected by metal. All
V
SS
2.5 pins are internally connected by metal. V
DD
A, V
DD
X and V
DD
R as well as V
SS
A, V
SS
X and V
SS
R
are connected by anti-parallel diodes for ESD protection.
3.7.3
Supply Current Characteristics
Table 15
and
Table 16
list supply current characteristics for MAC71
x
1 and MAC71
x
6 devices at 40 MHz
and 50 MHz operation, respectively. Characteristics for MAC71
x
2 devices are to be determined (TBD).
All current measurements are without output loads. Unless otherwise noted the currents are measured in
single chip mode, internal voltage regulator enabled at the specified system frequency, using a 4 MHz
oscillator in low power mode. Production testing is performed using a square wave signal at the EXTAL
input. In expanded modes, the currents are highly dependent on the load and duty cycle on the address,
data and control signals, thus no general numbers can be given. A good estimate is to take the single chip
currents and add the currents due to the external loads.
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