RF31 Hope Microelectronics co., Ltd, RF31 Datasheet - Page 43

• Manufacturer Part Number: RF31
• Description: Rf31 Ism Receiver
• Manufacturer: Hope Microelectronics co., Ltd

8. Auxiliary Functions
8.1. Smart Reset
The RF31 contains an enhanced integrated SMART RESET or POR circuit. The POR circuit contains both a
classic level threshold reset as well as a slope detector POR. This reset circuit was designed to produce reliable
reset signal in any circumstances. Reset will be initiated if any of the following conditions occur:




The reset will initialize all registers to their default values. The reset signal is also available for output and use by
the microcontroller by using the default setting for GPIO_0. The inverted reset signal is available by default on
GPIO_1.
Initial power on, when VDD starts from 0V: reset is active till VDD reaches V
When VDD decreases below V
A software reset via ―Register 08h. Operating Mode and Function Control 2,‖: reset is active for time.T
On the rising edge of a VDD glitch when the supply voltage exceeds the following time functioned limit:
VDD Glitch Reset Pulse
Release Reset Voltage
Power-On VDD Slope
Software Reset Pulse
Threshold Voltage
Reference Slope
Low VDD Limit
Parameter
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LD
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TSWRST
Symbol
for any reason: reset is active till VDD reaches V
SVDD
VTSD
Figure 17. POR Glitch Parameters
VRR
VLD
TP
k
Table 21. POR Parameters
Also occurs after SDN, and
VLD<VRR is guaranteed
tested VDD slope region
initial power on
Comment
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RR
(see table);
0.85
0.03
Min
0.7
50
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5
RR
again;
R F 3 1
Typ
300
1.3
0.4
0.2
15
1
V/ms
Max
1.75
470
1.3
40
SWRST
Units
V/ms
0.03
ms
us
43
V
V
V