RFM22B-868-S1 QUASAR, RFM22B-868-S1 Datasheet - Page 46

• Manufacturer Part Number: RFM22B-868-S1
• Description: MODULE, TRANSCEIVER, 20DB,SMD,868MHZ
• Manufacturer: QUASAR

Specifications of RFM22B-868-S1

• Modulation Type: FSK, GFSK, OOK
• Data Rate Max: 256Kbps
• Sensitivity: -121dBm
• Supply Voltage Range: 1.8V To 3.6V
• Supply Current: 85mA
• Interface Type: SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

R F M 2 2 B / 2 3 B
8. Auxiliary Functions
8.1. Smart Reset
The RFM22B/23B 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 a
reliable reset signal under 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.
46
Release Reset Voltage
Power-On VDD Slope
Low VDD Limit
Software Reset Pulse
Threshold Voltage
Reference Slope
VDD Glitch Reset Pulse
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Initial power on, VDD starts from gnd: 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:
Parameter
VDD starts to rise
0.4V
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LD
TSWRST
Figure 26. POR Glitch Parameters
Symbol
SVDD
VTSD
for any reason: reset is active till VDD reaches V
VRR
VLD
VDD(t)
TP
k
Table 15. POR Parameters
t=0,
VDD nom.
Also occurs after SDN, and
VLD<VRR is guaranteed
tested VDD slope region
initial power on
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reset:
Vglitch>=0.4+t*0.2V/ms
Comment
showing glitch
actual VDD(t)
Reset
0.4V+t*0.2V/ms
T
P
reset limit:
RR
(see table);
t
0.85
0.03
Min
0.7
50
5
RR
Typ
1.3
0.4
0.2
;
16
1
Max
1.75
300
470
1.3
40
V/ms
V/ms
Unit
ms
SWRST
us
V
V
V