ATA5771-DK1 Atmel, ATA5771-DK1 Datasheet - Page 46

• Manufacturer Part Number: ATA5771-DK1
• Description: BOARD XMITTER FOR ATA5771 868MHZ
• Manufacturer: Atmel
• Type: Transmitterr

Specifications of ATA5771-DK1

• Frequency: 868MHz
• Maximum Frequency: 868 MHz
• Supply Voltage (max): 4 V
• Supply Voltage (min): 2 V
• Supply Current: 8.5 mA
• Product: RF Development Tools
• For Use With/related Products: ATA5771
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.11.1.2
46
Atmel ATA5771/73/74
Power-on Reset
Figure 4-13. Reset Logic
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection
level is defined in
is activated whenever V
the Start-up Reset, as well as to detect a failure in supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
delay, when V
Figure 4-14. MCU Start-up, RESET Tied to V
INTERNAL
V
TIME-OUT
BODLEVEL [1..0]
CC
RESET
RESET
V
CCRR
CC
decreases below the detection level.
Section 8.3.4 “System and Reset Characterizations” on page
Pull-up Resistor
FILTER
SPIKE
V
V
V
RST
CC
PORMA X
PORMIN
is below the detection level. The POR circuit can be used to trigger
t
TOUT
CKSEL[1:0]
CC
Power-on Reset
Reset Circuit
SUT[1:0]
Brown-out
Watchdog
Oscillator
Generator
rise. The RESET signal is activated again, without any
Circuit
Clock
CK
CC
Register (MCUSR)
MCU Status
DATA BUS
Delay Counters
TIMEOUT
190. The POR
9137E–RKE–12/10