ATTINY25V-15ST Atmel, ATTINY25V-15ST Datasheet - Page 38

• Manufacturer Part Number: ATTINY25V-15ST
• Description: MCU AVR 2K FLASH 4MHZ 8-SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY25V-15ST

• Package / Case: 8-SOIC (3.9mm Width)
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 8MHz
• Number Of I /o: 6
• Eeprom Size: 128 x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Program Memory Size: 2KB (2K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: USI
• Core Size: 8-Bit
• Processor Series: ATTINY2x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
=