参数资料
型号: SPC5643AF0MLU2
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: MICROCONTROLLER, PQFP176
封装: 24 X 24 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, LQFP-176
文件页数: 125/142页
文件大小: 886K
代理商: SPC5643AF0MLU2
Electrical characteristics
MPC5644A Microcontroller Data Sheet, Rev. 4
Preliminary—Subject to Change Without Notice
Freescale Semiconductor
83
3.6.2
Regulator Example
In designs where the MPC5644A microcontroller’s internal regulators are used, a ballast is required for generation of the 1.2 V
internal supply. No ballast is required when an external 1.2 V supply is used.
Figure 8. Core voltage regulator controller external components preferred configuration
3.6.3
Recommended power transistors
The following NPN transistors are recommended for use with the on-chip voltage regulator controller: ON SemiconductorTM
BCP68T1 or NJD2873 as well as Philips SemiconductorTM BCP68. The collector of the external transistor is preferably
connected to the same voltage supply source as the output stage of the regulator.
4 Values are based on I
DD from high-use applications as explained in the IDD Electrical Specification.
Table 17. Recommended operating characteristics
Symbol
Parameter
Value
Unit
hFE () DC current gain (Beta)
60 – 550
PD
Absolute minimum power dissipation
>1.0
(1.5 preferred)
W
ICMaxDC Minimum peak collector current
1.0
A
VCESAT Collector-to-emitter saturation voltage
> 2001
1 Adjust resistor at bipolar transistor collector for 3.3 V/5.0 V to avoid VCE < VCE
SAT.
mV
VBE
Base-to-emitter voltage
>0.7
V
MCU
The bypass transistor
MUST be operated out
of saturation region.
Mandatory decoupling
capacitor network
VDDREG
VRCCTL
VDD
VSS
VRCCTL capacitor and resistor is required
4
6.8 F4 220 nF
680 nF
15
6.8
F
10
F
1.1–5.6
The resistor may or may not be
required. This depends on the
allowable power dissipation of
the npn bypass transistor
device. The resistor may be
used to limit the in-rush current
at power on.
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SPC5643LF0MLQ8R 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:MPC5643L Microcontroller Data Sheet