User Manual
Version 1.1
2011-07-15
deRFnode and deRFgateway
dresden elektronik
ingenieurtechnik gmbh
Enno-Heidebroek-Str. 12
12 7 Dr
n
rm n
Tel.: +49 351 31 85 00
Fax: +49 351 3 18 50 10
wireless@dresden-elektronik.de
www. r
n- l k r nik.
Page 11 of 56
5. Technical data
5.1. Mechanical
Table 4: Mechanical data
Mechanical
r in l in r i m
l
iz f P BA L x W x H
x 7 x
mm
5.2. Operation conditions
The recommended operating conditions are as follow:
Supply voltage:
VCC = 3.3VDC ?0.3VDC
Temperature:
T = -40癈 to +85癈
5.3. Electrical
5.3.1. Operational ranges
Since the voltage regulators threshold is fixed to 3.3V DC, operation is uncritical as long as
input voltage is above 3.3V. Below, operation is not recommended since assembled compo-
nents (MCU, Flash, EMAC, I2C-Sensors) will start to fail. The probability that they do grows,
the lower the voltage is. For concrete working voltage ranges please refer to the table below
as well as the respective components datasheets.
To avoid unstable behaviour, the board supplies a reset supervisor which drives a pin low, if
the input voltage sinks below 2.4V DC (deRFnode/gateway for AVR) respective 3.0V DC
(deRFnode/-gateway for ARM). This pin is routed to the radio module MCUs reset entry
(Pin5). To enable a too low voltage causing a MCU reset, JP4 must be closed. On ARM-
MCUs the reset supervisor must be explicitly enabled (see section 8.4).
Table 5: Operational ranges
Device
Remark
Required
perational
oltage range
Current consumption
Min
Max
Min
T
Max
T91SAM7X512 on deRFarm7 radio mod-
l
3.0V
3.6V
60礎 90mA
2)
200mA
2)
T86RF231
nd
T RF212
any Atmel radio transceiv-
er used on deRFarm7 ra-
i m
l
1.8V
3.6V d0.2礎 ~12mA
1)
<25mA
tmega128RFA1 on deRFmega128 radio
modules
1.8V
3.6V
20nA
12,5mA
1,2)
--- 2)
DP83848C
on deRFgateway for ARM
nl
3.0V
3.3V
14mA
---
92mA
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