ATmega32C1 Automotive Atmel Corporation, ATmega32C1 Automotive Datasheet - Page 49

• Manufacturer Part Number: ATmega32C1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega32C1 Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

7.2.3
7647G–AVR–09/11
Brown-out Detection
ATmega16/32/64/M1/C1 has an On-chip Brown-out Detection (BOD) circuit for monitoring the
V
can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike
free Brown-out Detection. The hysteresis on the detection level should be interpreted as V
= V
Table 7-2.
Notes:
Table 7-3.
Notes:
When the BOD is enabled, and V
ure 7-5 on page
above the trigger level (V
after the Time-out period t
The BOD circuit will only detect a drop in V
ger than t
Symbol
V
t
CC
BOD
HYST
BOT
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD
+ V
1. V
2. Values are guidelines only.
1. Values are guidelines only.
BOD
HYST
where this is the case, the device is tested down to V
This guarantees that a Brown-Out Reset will occur before V
rect operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 010 for Low Operating Voltage and BODLEVEL = 101 for High Operating
Voltage .
BOT
given in
BODLEVEL Fuse Coding
Brown-out Characteristics
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
/2 and V
BODLEVEL 2..0 Fuses
may be below nominal minimum operating voltage for some devices. For devices
50), the Brown-out Reset is immediately activated. When V
Table
BOT-
111
110
011
100
010
001
101
000
TOUT
BOT+
= V
7-3.
has expired.
BOT
in
CC
Figure 7-5 on page
- V
decreases to a value below the trigger level (V
Atmel ATmega16/32/64/M1/C1
HYST
(1)(2)
(1)
/2.
CC
if the voltage stays below the trigger level for lon-
50), the delay counter starts the MCU
Min.
CC
Typ V
Disabled
= V
4.5
4.4
4.3
4.2
2.8
2.7
2.6
CC
Typ.
BOT
BOT
80
2
drops to a voltage where cor-
during the production test.
Max.
CC
Units
BOT-
increases
V
V
V
V
V
V
V
Units
mV
in
µs
BOT+
Fig-
49