PIC16F877-04E/PT Microchip Technology, PIC16F877-04E/PT Datasheet - Page 615

• Manufacturer Part Number: PIC16F877-04E/PT
• Description: IC MCU FLASH 8KX14 EE 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877-04E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC16F87704E/PT

31.3.1
1997 Microchip Technology Inc.
I
PD
vs. V
DD
I
referred to as power-down current. These tests are taken with all I/O as inputs, either pulled high
or low. That is, there are no floating inputs, nor are any pins driving an output (with a load).
The characterization shows graphs for both the Watchdog Timer (WDT) disabled and enabled.
This is required since the WDT requires an on-chip RC oscillator which consumes additional cur-
rent.
Since the device may have certain features and modules that can operate while the device is in
sleep mode. Some of these modules are:
• Watchdog Timer (WDT)
• Brown-out Reset (BOR) circuitry
• Timer1
• Analog to Digital converter
• LCD module
• Comparators
• Voltage Reference
If these features are operating while the device is in sleep mode, a higher current will be con-
sumed. When all features are disabled, the device will consume the lowest possible current (the
leakage current). If more then one feature is enabled then the expected current can easily be cal-
culated as the base current (everything disabled and in sleep mode) plus all delta currents.
Example 31-1
WDT and Timer1 oscillator enabled.
Example 31-1:I
PD
Base Current
WDT Delta Current
Timer1 Delta Current
Total Sleep Current
is the current (I) that the device consumes when the device is in sleep mode (power-down),
Section 31. Device Characteristics
shows an example of calculating the typical currents for a device at 5V, with the
PD
Calculations with WDT and TIMER1 Oscillator Enabled (@ 5V)
14 nA
14 A
22 A
36 A
; Device leakage current
; 14 A - 14 nA = 14 A
; 22 A - 14 nA = 22 A
;
DS31031A-page 31-3
31