ATTINY88-15MZ Atmel, ATTINY88-15MZ Datasheet - Page 42

• Manufacturer Part Number: ATTINY88-15MZ
• Description: IC MCU AVR 8B 8KB FLASH 32QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY88-15MZ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 28
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.2.2
8.2.3
42
ATtiny88 Automotive
External Reset
Brown-out Detection
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
running. Shorter pulses are not guaranteed to generate a reset. When the applied signal
reaches the Reset Threshold Voltage – V
MCU after the Time-out period – t
RSTDISBL fuse, see
Figure 8-4.
ATtiny88 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
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
and V
trigger level (V
increases above the trigger level (V
the Time-out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 8-5.
BOT-
BOD
= V
CC
given in
BOT
External Reset During Operation
Brown-out Reset During Operation
INTERNAL
TIME-OUT
BOT-
RESET
RESET
- V
V
in
HYST
CC
TOUT
Table 20-4 on page
“System and Reset Characterizations” on page
Figure
/2. When the BOD is enabled, and V
has expired.
Table 21-4 on page
8-5), the Brown-out Reset is immediately activated. When V
TOUT
BOT+
V
– has expired. The External Reset can be disabled by the
BOT-
in
RST
192.
CC
Figure
– on its positive edge, the delay counter starts the
if the voltage stays below the trigger level for lon-
211) will generate a reset, even if the clock is not
8-5), the delay counter starts the MCU after
CC
V
t
TOUT
BOT+
decreases to a value below the
211.
BOT+
= V
CC
9157B–AVR–01/10
BOT
level during
+ V
HYST
CC
/2