PIC16F737-I/SP Microchip Technology Inc., PIC16F737-I/SP Datasheet - Page 159

• Manufacturer Part Number: PIC16F737-I/SP
• Description: 28 PIN, 7 KB FLASH, 368 RAM, 25 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F737-I/SP

• A/d Inputs: 5-Channel, 8-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 25
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 7K Bytes
• Ram Size: 192 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

12.2
The ADCON2 register allows the user to select an
acquisition time that occurs each time the GO/DONE
bit is set.
When the GO/DONE bit is set, sampling is stopped and
a conversion begins. The user is responsible for ensur-
ing the required acquisition time has passed between
selecting the desired input channel and setting the
GO/DONE bit. This occurs when the ACQT2:ACQT0
bits (ADCON2<5:3>) remain in their Reset state (‘000’)
and is compatible with devices that do not offer
programmable acquisition times.
If desired, the ACQT bits can be set to select a
programmable acquisition time for the A/D module.
When the GO/DONE bit is set, the A/D module con-
tinues to sample the input for the selected acquisition
time, then automatically begins a conversion. Since the
acquisition time is programmed, there may be no need
to wait for an acquisition time between selecting a
channel and setting the GO/DONE bit.
In either case, when the conversion is completed, the
GO/DONE bit is cleared, the ADIF flag is set and the
A/D begins sampling the currently selected channel
again. If an acquisition time is programmed, there is
nothing to indicate if the acquisition time has ended or
if the conversion has begun.
TABLE 12-1:
 2004 Microchip Technology Inc.
Note 1:
2:
3:
Selecting and Configuring
Automatic Acquisition Time
The RC source has a typical T
When the device frequencies are greater than 1 MHz, the RC A/D conversion clock source is only
recommended for Sleep operation.
For extended voltage devices (LF), please refer to Section 18.0 “Electrical Characteristics”.
Operation
RC
16 T
32 T
64 T
2 T
4 T
8 T
T
(1,2,3)
OSC
OSC
OSC
OSC
OSC
OSC
AD
vs. MAXIMUM DEVICE OPERATING FREQUENCIES (STANDARD DEVICES (F))
AD Clock Source (T
AD
time of 4 s but can vary between 2-6 s.
ADCS2:ADCS1:ADCS0
AD
)
000
100
001
101
010
110
x11
12.3
The A/D conversion time per bit is defined as T
A/D conversion requires a minimum 12 T
conversion. The source of the A/D conversion clock is
software selected. The seven possible options for T
are:
• 2 T
• 4 T
• 8 T
• 16 T
• 32 T
• 64 T
• Internal A/D module, RC oscillator (2-6 s)
For correct A/D conversions, the A/D conversion clock
(T
of 1.6 s.
Table 12-1 shows the resultant T
the device operating frequencies and the A/D clock
source selected.
AD
) must be selected to ensure a minimum T
OSC
OSC
OSC
OSC
OSC
OSC
Selecting the A/D Conversion
Clock
Maximum Device Frequency
PIC16F7X7
1.25 MHz
2.5 MHz
(Note 1)
10 MHz
20 MHz
20 MHz
AD
5 MHz
DS30498C-page 157
times derived from
AD
per 10-bit
AD
AD
. The
time
AD