RFM42B-868-S1 QUASAR, RFM42B-868-S1 Datasheet - Page 35

• Manufacturer Part Number: RFM42B-868-S1
• Description: MODULE, TRANSMITTER, 20DB,SMD,868MHZ
• Manufacturer: QUASAR

Specifications of RFM42B-868-S1

• Modulation Type: FSK, GFSK, OOK
• Supply Voltage Range: 1.8V To 3.6V
• Supply Current: 85mA
• Interface Type: SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7. Auxiliary Functions
7.1. Smart Reset
The RFM42B/43B 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.
Tel: [phone]
Initial power on, VDD starts from gnd: reset is active till V
When V
A software reset via “Register 08h. Operating Mode and Function Control 2,”: reset is active for time T
V
Release Reset Voltage
Power-On VDD Slope
Low VDD Limit
Software Reset Pulse
Threshold Voltage
Reference Slope
VDD Glitch Reset Pulse
DD
glitch when the supply voltage exceeds the following time functioned limit:
DD
Parameter
decreases below V
Fax: [phone]
VDD starts to rise
0.4V
LD
for any reason: reset is active till V
TSWRST
Figure 16. POR Glitch Parameters
Symbol
SVDD
VTSD
VRR
VDD(t)
VLD
TP
k
Table 13. POR Parameters
t=0,
VDD nom.
Also occurs after SDN, and
VLD<VRR is guaranteed
tested VDD slope region
initial power on
E-mail: [e-mail] http://www.hoperf.com
reset:
Vglitch>=0.4+t*0.2V/ms
Comment
DD
reaches V
showing glitch
actual VDD(t)
Reset
0.4V+t*0.2V/ms
T
P
reset limit:
DD
RR
reaches V
(see table);
t
0.85
0.03
Min
0.7
50
—
—
5
RR
RFM42B/43B
;
Typ
1.3
0.4
0.2
15
—
—
1
Max
1.75
300
470
1.3
40
—
—
SWRST
V/ms
V/ms
Unit
ms
µs
V
V
V
35