PIC16LC77-04I/PQ Microchip Technology, PIC16LC77-04I/PQ Datasheet - Page 123
![IC MCU OTP 8KX14 A/D PWM 44-MQFP](/photos/6/59/65984/150-44-pqfp_sml.jpg)
PIC16LC77-04I/PQ
Manufacturer Part Number
PIC16LC77-04I/PQ
Description
IC MCU OTP 8KX14 A/D PWM 44-MQFP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16LC77-04I/PQ
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
OTP
Ram Size
368 x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 6 V
Data Converters
A/D 8x8b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-MQFP, 44-PQFP
Core
PIC
Processor Series
PIC16LC
Data Bus Width
8 bit
Maximum Clock Frequency
20 MHz
Data Ram Size
368 B
Data Rom Size
368 B
On-chip Adc
8
Number Of Programmable I/os
33
Number Of Timers
3 bit
Operating Supply Voltage
2.5 V to 6 V
Mounting Style
SMD/SMT
Height
2 mm
Interface Type
I2C, SPI, USART
Length
10 mm
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Supply Voltage (max)
6 V
Supply Voltage (min)
2.5 V
Width
10 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16LC77-04I/PQ
Manufacturer:
Microchip Technology
Quantity:
10 000
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13.4.1
Not all applications require a result with 8-bits of reso-
lution, but may instead require a faster conversion time.
The A/D module allows users to make the trade-off of
conversion speed to resolution. Regardless of the res-
olution required, the acquisition time is the same. To
speed up the conversion, the clock source of the A/D
module may be switched so that the T
the minimum specified time (see the applicable electri-
cal specification). Once the T
mum specified time, all the following A/D result bits are
not valid (see A/D Conversion Timing in the Electrical
Specifications section.) The clock sources may only be
switched between the three oscillator versions (cannot
be switched from/to RC). The equation to determine
the time before the oscillator can be switched is as fol-
lows:
EXAMPLE 13-3: 4-BIT vs. 8-BIT CONVERSION TIMES
Note 1: PIC16C7X devices have a minimum T
T
T
2T
1997 Microchip Technology Inc.
AD
OSC
Conversion time = 2T
Where: N = number of bits of resolution required.
AD
+ N • T
FASTER CONVERSION - LOWER
RESOLUTION TRADE-OFF
AD
+ (8 - N)(2T
AD
+ N • T
OSC
AD
)
time violates the mini-
AD
+ (8 - N)(2T
AD
time violates
AD
OSC
time of 1.6 s.
)
Since the T
user must use some method (a timer, software loop,
etc.) to determine when the A/D oscillator may be
changed. Example 13-3 shows a comparison of time
required for a conversion with 4-bits of resolution, ver-
sus the 8-bit resolution conversion. The example is for
devices operating at 20 MHz and 16 MHz (The A/D
clock is programmed for 32T
immediately after 6T
for 2T
The 2T
4-bits will not be converted to correct values.
Freq. (MHz)
OSC
OSC
20
16
20
16
20
16
.
violates the minimum T
AD
(1)
is based from the device oscillator, the
AD
12.5 s
62.5 ns
1.6 s
2.0 s
50 ns
10 s
, the A/D clock is programmed
4-bit
PIC16C7X
OSC
Resolution
), and assumes that
AD
DS30390E-page 123
time since the last
62.5 ns
1.6 s
2.0 s
50 ns
16 s
20 s
8-bit
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