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参数资料
型号： MC56F8257VLH
厂商： Freescale Semiconductor
文件页数： 52/88页
文件大小： 0K
描述： DSC 64K FLASH 60MHZ 64-LQFP
标准包装： 160
系列： 56F8xxx
核心处理器： 56800E
芯体尺寸： 16-位
速度： 60MHz
连通性： CAN，I²C，LIN，SCI，SPI
外围设备： LVD，POR，PWM，WDT
输入/输出数： 54
程序存储器容量： 64KB（32K x 16）
程序存储器类型： 闪存
RAM 容量： 4K x 16
电压 - 电源 (Vcc/Vdd)： 3 V ~ 3.6 V
数据转换器： A/D 16x12b，D/A 1x12b
振荡器型： 内部
工作温度： -40°C ~ 105°C
封装/外壳： 64-LQFP
包装： 管件
MC56F825x/MC56F824x Digital Signal Controller, Rev. 3
Specifications
Freescale Semiconductor
56
7.8
Power-On Reset, Low Voltage Detection Specification
7.9
Voltage Regulator Specifications
The MC56F825x/MC56F824x has two on-chip regulators. One supplies the PLL, crystal oscillator, NanoEdge placement
PWM, and relaxation oscillator. It has no external pins and therefore has no external characteristics that must be guaranteed
(other than proper operation of the device). The second regulator supplies approximately 2.5 V to the
MC56F825x/MC56F824x’s core logic. For proper operation, this regulator requires an external capacitor of 2.2 F or greater.
Ceramic and tantalum capacitors tend to provide better performance tolerances. The output voltage can be measured directly
on the VCAP pin. The specifications for this regulator appear in Table 26.
7.10
AC Electrical Characteristics
Tests are conducted using the input levels specified in Table 23. Unless otherwise specified, propagation delays are measured
from the 50% to the 50% point, and rise and fall times are measured between the 10% and 90% points, as shown in Figure 15.
Figure 15. Input Signal Measurement References
Table 25. Power-On Reset and Low-Voltage Detection Parameters
Characteristic
Symbol
Min
Typ
Max
Unit
Low-Voltage Interrupt for 3.3 V supply1
1 When VDD drops below LVI27, an interrupt is generated.
VLVI27
2.6
2.7
2.8
V
Low-Voltage Interrupt for 2.5 V supply2
2 When VDD drops below LVI21, an interrupt is generated.
VLVI21
—2.18—
V
Low-Voltage Interrupt Recovery Hysteresis
VEIH
—50
—
mV
Power-On Reset Threshold3
3 While power is ramping up, this signal remains active for as long as the internal 2.5 V is below 2.18 V or
the 3.3 V VDD voltage is below 2.7 V, no matter how long the ramp-up rate is. The internally regulated
voltage is typically 100 mV less than VDD during ramp-up until 2.5 V is reached, at which time it self-reg-
ulates.
POR
2.6
2.7
2.8
V
Brown-Out Reset Threshold4
4 Brown-Out Reset occurs whenever the internally regulated 2.5 V digital supply drops below 1.8 V.
BOR
—
1.8
1.9
V
Table 26. Regulator Parameters
Characteristic
Symbol
Min
Typical
Max
Unit
Short Circuit Current
ISS
—
900
1300
mA
Short Circuit Tolerance
(VCAP shorted to ground)
TRSC
——
30
minutes
VIH
VIL
Fall Time
Midpoint1
Low
High
90%
50%
10%
Rise Time
The midpoint is VIL + (VIH – VIL)/2.
Input Signal
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