AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 55

• Manufacturer Part Number: AT90PWM81-16SN
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16SN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (7.5mm Width)
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Timers: 1
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 1 Channel
• Height: 2.35 mm
• Length: 13 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7.6 mm
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.3.2
7.4
7734P–AVR–08/10
Watchdog Timer
Voltage Reference Characteristics
DAC is used. To reduce power consumption in Power-down mode, the user can avoid the four conditions
above to ensure that the reference is turned off before entering Power-down mode.
Table 7-4.
Note:
AT90PWM81 has an Enhanced Watchdog Timer (WDT). The main features are:
•
•
•
•
Figure 7-7.
The Watchdog Timer (WDT) is a timer counting cycles of a separate on-chip 128 kHz oscillator. The
WDT gives an interrupt or a system reset when the counter reaches a given time-out value. In normal
operation mode, it is required that the system uses the WDR - Watchdog Timer Reset - instruction to
restart the counter before the time-out value is reached. If the system doesn't restart the counter, an inter-
rupt or system reset will be issued.
Clocked from separate On-chip Oscillator
3 Operating modes
Selectable Time-out period from 1ms to 8s
Possible Hardware fuse Watchdog always on (WDTON) for fail-safe mode
Symbol
V
I
– Interrupt
– System Reset
– Interrupt and System Reset
t
BG
BG
BG
1. Values are guidelines only.
Parameter
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current
consumption
Internal Voltage Reference Characteristics
Watchdog Timer
OSCILLATOR
128 KHz
WDP3
WDIF
WDIE
Condition
(1)
Min.
INTERRUPT
MCU RESET
Typ.
AT90PWM81
1.1
40
15
Max.
Units
µA
µs
V
55