參數(shù)資料
型號： PIC12HV615
廠商： Microchip Technology Inc.
英文描述： 8-Pin Flash-Based, 8-Bit CMOS Microcontrollers
中文描述： 8引腳閃存的基礎上，8位CMOS微控制器
文件頁數(shù)： 113/168頁
文件大小： 1347K
代理商： PIC12HV615
2006 Microchip Technology Inc.
Preliminary
DS41302A-page 111
PIC12F609/615/12HV609/615
12.0
VOLTAGE REGULATOR
The PIC12HV609/HV615 includes a permanent
internal 5 volt (nominal) shunt regulator in parallel with
the V
DD
pin. This eliminates the need for an external
voltage regulator in systems sourced by an
unregulated supply. All external devices connected
directly to the V
DD
pin will share the regulated supply
voltage and contribute to the total V
DD
supply current
(I
LOAD
).
12.1
Regulator Operation
A shunt regulator generates a specific supply voltage
by creating a voltage drop across a pass resistor R
SER
.
The voltage at the V
DD
pin of the microcontroller is
monitored and compared to an internal voltage refer-
ence. The current through the resistor is then adjusted,
based on the result of the comparison, to produce a
voltage drop equal to the difference between the supply
voltage V
UNREG
and the V
DD
of the microcontroller.
See Figure 12-1 for voltage regulator schematic.
FIGURE 12-1:
VOLTAGE REGULATOR
An external current limiting resistor, R
SER
, located
between the unregulated supply, V
UNREG
, and the V
DD
pin, drops the difference in voltage between V
UNREG
and V
DD
. R
SER
must be between R
MAX
and R
MIN
as
defined by Equation 12-1.
EQUATION 12-1:
R
SER
LIMITING RESISTOR
12.2
Regulator Considerations
The supply voltage V
UNREG
and load current are not
constant. Therefore, the current range of the regulator
is limited. Selecting a value for R
SER
must take these
three factors into consideration.
Since the regulator uses the band gap voltage as the
regulated voltage reference, this voltage reference is
permanently enabled in the PIC12HV609/HV615
device.
The shunt regulator will still consume current when
below operating voltage range for the shunt regulator.
12.3
Design Considerations
For more information on using the shunt regulator and
managing current load, see Application Note AN1035,
“
Designing with HV Microcontrollers”
(DS01035).
Feedback
V
DD
V
SS
C
BYPASS
R
SER
V
UNREG
I
SUPPLY
I
SHUNT
I
LOAD
Device
R
MAX
=
(VU
MIN
- 5V)
1.05 (4
M
A + I
LOAD
)
R
MIN
=
(VU
MAX
- 5V)
0.95 (50
M
A)
Where:
R
MAX
= maximum value of R
SER
(ohms)
R
MIN
= minimum value of R
SER
(ohms)
VU
MIN
= minimum value of V
UNREG
VU
MAX
= maximum value of V
UNREG
V
DD
= regulated voltage (5V nominal)
I
LOAD
= maximum expected load current in mA
including I/O pin currents and external
circuits connected to V
DD
.
1.05
= compensation for +5% tolerance of R
SER
0.95
= compensation for -5% tolerance of R
SER
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相關代理商/技術參數(shù)
參數(shù)描述
PIC12HV615-E/MD 功能描述:8位微控制器 -MCU 2KB Flash 64 RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC12HV615-E/MF 功能描述:8位微控制器 -MCU 1.75KB Flash 64B RAM 6 I/O 8MHz INT OSC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC12HV615-E/MS 功能描述:8位微控制器 -MCU 2KB Flash 64 RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC12HV615-E/P 功能描述:8位微控制器 -MCU 2KB Flash 64 RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC12HV615-E/SN 功能描述:8位微控制器 -MCU 2KB Flash 64 RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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