PIC16F1826-I/SO Microchip Technology Inc., PIC16F1826-I/SO Datasheet - Page 222

• Manufacturer Part Number: PIC16F1826-I/SO
• Description: 18 SOIC .300in TUBE, 3.5 KB Flash, 256 bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhan
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1826-I/SO

• A/d Inputs: 12-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 15
• Interface: I2C/SPI/UART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin SOIC
• Programmable Memory: 3.5K Bytes
• Ram Size: 256 Bytes
• Speed: 32 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part

PIC16(L)F1826/27
24.4.5
In Half-Bridge applications where all power switches
are modulated at the PWM frequency, the power
switches normally require more time to turn off than to
turn on. If both the upper and lower power switches are
switched at the same time (one turned on, and the
other turned off), both switches may be on for a short
period of time until one switch completely turns off.
During this brief interval, a very high current
(shoot-through current) will flow through both power
switches, shorting the bridge supply. To avoid this
potentially destructive shoot-through current from
flowing during switching, turning on either of the power
switches is normally delayed to allow the other switch
to completely turn off.
In Half-Bridge mode, a digitally programmable
dead-band delay is available to avoid shoot-through
current from destroying the bridge power switches. The
delay occurs at the signal transition from the non-active
state to the active state. See
illustration. The lower seven bits of the associated
PWMxCON register
period in terms of microcontroller instruction cycles
(T
FIGURE 24-17:
DS41391D-page 222
CY
Standard Half-Bridge Circuit (“Push-Pull”)
or 4 T
OSC
PROGRAMMABLE DEAD-BAND
DELAY MODE
).
(Register
EXAMPLE OF HALF-BRIDGE APPLICATIONS
24-4) sets the delay
Figure 24-16
PxA
PxB
for
FET
Driver
FET
Driver
FIGURE 24-16:
PxA
PxB
td = Dead-Band Delay
Note 1: At this time, the TMRx register is equal to the
(2)
(2)
V+
V-
(1)
2: Output signals are shown as active-high.
td
Pulse Width
PRx register.
Load
Period
td
EXAMPLE OF
HALF-BRIDGE PWM
OUTPUT
 2011 Microchip Technology Inc.
+
V
-
+
V
-
(1)
Period
(1)