ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 38

• Manufacturer Part Number: ATtiny25 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny25 Automotive

• Flash (kbytes): 2 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 6
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• 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: 5
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

8.5
38
Brown-out Detection
ATtiny25/45/85
Figure 8-4.
ATtiny25/45/85 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
during operation by comparing it to a fixed trigger level. The trigger level for the BOD 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 8-2.
Note:
Table 8-3.
Notes:
Symbol
V
V
t
BOT
BOD
RAM
HYST
+ V
BODLEVEL [2..0] Fuses
1. V
2. Centered value, not tested.
1. This is the limit to which VDD can be lowered without losing RAM data
HYST
this is the case, the device is tested down to V
antees that a Brown-out Reset will occur before V
operation of the microcontroller is no longer guaranteed.
CC
BOT
/2 and V
External Reset During Operation
BODLEVEL Fuse Coding
Brown-out Characteristics
Parameter
RAM Retention Voltage
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
may be below nominal minimum operating voltage for some devices. For devices where
111
110
101
100
011
010
001
000
BOT-
= V
BOT
- V
(1)
HYST
Min V
(1)
/2.
1.7
2.5
4.0
BOT
CC
= V
Typ V
CC
2.3
2.2
1.9
2.0
1.8
2.7
4.3
BOT
drops to a voltage where correct
BOD Disabled
(2)
(2)
(2)
(2)
BOT
during the production test. This guar-
Min
Typ
50
50
Max V
2
2.0
2.9
4.6
BOT
Max
7598H–AVR–07/09
Units
CC
Units
mV
mV
BOT+
V
µs
level
=