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参数资料
型号： SPC560B50L3-ENG
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 32-BIT, FLASH, 64 MHz, MICROCONTROLLER, PQFP100
封装： 14 X 14 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-100
文件页数： 94/113页
文件大小： 983K
代理商： SPC560B50L3-ENG
SPC560Bx, SPC560Cx
Electrical characteristics
Doc ID 14619 Rev 7
81/113
CP2 is reported in parallel to CP1 (call CP = CP1 + CP2), the two capacitances CP and
CS are in series, and the time constant is
Equation 5
Equation 5 can again be simplified considering only CS as an additional worst
condition. In reality, the transient is faster, but the A/D converter circuitry has been
designed to be robust also in the very worst case: the sampling time TS is always much
longer than the internal time constant:
Equation 6
The charge of CP1 and CP2 is redistributed also on CS, determining a new value of the
voltage VA1 on the capacitance according to Equation 7:
Equation 7
2.
A second charge transfer involves also CF (that is typically bigger than the on-chip
capacitance) through the resistance RL: again considering the worst case in which CP2
and CS were in parallel to CP1 (since the time constant in reality would be faster), the
time constant is:
Equation 8
In this case, the time constant depends on the external circuit: in particular imposing
that the transient is completed well before the end of sampling time TS, a constraints on
RL sizing is obtained:
Equation 9
Of course, RL shall be sized also according to the current limitation constraints, in
combination with RS (source impedance) and RF (filter resistance). Being CF
definitively bigger than CP1, CP2 and CS, then the final voltage VA2 (at the end of the
charge transfer transient) will be much higher than VA1. Equation 10 must be respected
(charge balance assuming now CS already charged at VA1):
Equation 10
The two transients above are not influenced by the voltage source that, due to the presence
of the RFCF filter, is not able to provide the extra charge to compensate the voltage drop on
CS with respect to the ideal source VA; the time constant RFCF of the filter is very high with
respect to the sampling time (TS). The filter is typically designed to act as anti-aliasing.
1
R
SW
R
AD
+
=
C
P
C
S
C
P
C
S
+
----------------------
1
R
SW
R
AD
+
C
S
T
S
V
A1
C
S
C
P1
C
P2
++
V
A
C
P1
C
P2
+
=
2
R
L
C
S
C
P1
C
P2
++
10
2
10 R
L
C
S
C
P1
C
P2
++
=T
S
V
A2
C
S
C
P1
C
P2
C
F
++
+
V
A
C
F
V
A1
+C
P1
C
P2
+C
S
+
=
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SPC560B50L5C6E0Y 功能描述:32位微控制器 - MCU 32-BIT Embedded MCU 64 MHz 512kB Body RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT
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SPC560B60L5C6E0X 制造商:STMicroelectronics 功能描述:IC MCU 32BIT 1MB FLASH 144LQFP
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