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| 型號(hào)： | PIC16LV54AT-02/SS |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 111/194頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU OTP 512X12 20SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,600 |
| 系列： | PIC® 16C |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 2MHz |
| 外圍設(shè)備： | POR，WDT |
| 輸入/輸出數(shù)： | 12 |
| 程序存儲(chǔ)器容量： | 768B（512 x 12） |
| 程序存儲(chǔ)器類(lèi)型： | OTP |
| RAM 容量： | 25 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 3.8 V |
| 振蕩器型： | 外部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 包裝： | 帶卷 (TR) |
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2002 Microchip Technology Inc.
Preliminary
DS30453D-page 21
PIC16C5X
5.1
Power-On Reset (POR)
The PIC16C5X family incorporates on-chip Power-On
Reset (POR) circuitry which provides an internal chip
RESET for most power-up situations. To use this fea-
ture, the user merely ties the MCLR/VPP pin to VDD. A
simplified block diagram of the on-chip Power-On
Reset circuit is shown in Figure 5-1.
The Power-On Reset circuit and the Device Reset
Timer (Section 5.2) circuit are closely related. On
power-up, the RESET latch is set and the DRT is
RESET. The DRT timer begins counting once it detects
MCLR to be high. After the time-out period, which is
typically 18 ms, it will RESET the reset latch and thus
end the on-chip RESET signal.
A power-up example where MCLR is not tied to VDD is
before bringing MCLR high. The chip will actually come
out of reset TDRT msec after MCLR goes high.
In Figure 5-4, the on-chip Power-On Reset feature is
being used (MCLR and VDD are tied together). The VDD
is stable before the start-up timer times out and there is
no problem in getting a proper RESET. However,
too slowly. The time between when the DRT senses a
high on the MCLR/VPP pin, and when the MCLR/VPP
pin (and VDD) actually reach their full value, is too long.
In this situation, when the start-up timer times out, VDD
has not reached the VDD (min) value and the chip is,
therefore, not guaranteed to function correctly. For
such situations, we recommend that external RC cir-
cuits be used to achieve longer POR delay times
For more information on PIC16C5X POR, see
Power-
Up Considerations - AN522 in the Embedded Control
Handbook.
The POR circuit does not produce an internal RESET
when VDD declines.
FIGURE 5-2:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW VDD POWER-UP)
Note:
When the device starts normal operation
(exits the RESET condition), device oper-
ating parameters (voltage, frequency, tem-
perature, etc.) must be met to ensure
operation. If these conditions are not met,
the device must be held in RESET until the
operating conditions are met.
C
R1
R
D
MCLR
PIC16C5X
VDD
External Power-On Reset circuit is required
only if VDD power-up is too slow. The diode D
helps discharge the capacitor quickly when
VDD powers down.
R < 40 k
is recommended to make sure that
voltage drop across R does not violate the
device electrical specification.
R1 = 100
to 1 k will limit any current flow-
ing into MCLR from external capacitor C in the
event of MCLR pin breakdown due to Electro-
static Discharge (ESD) or Electrical Over-
stress (EOS).
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