PIC14000-04/SO Microchip Technology, PIC14000-04/SO Datasheet - Page 65

• Manufacturer Part Number: PIC14000-04/SO
• Description: IC MCU OTP 4KX14 A/D 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 14r

Specifications of PIC14000-04/SO

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 4MHz
• Connectivity: I²C
• Peripherals: POR, Temp Sensor, WDT
• Number Of I /o: 20
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Data Converters: Slope A/D
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SOIC (7.5mm Width)
• Controller Family/series: PIC14
• No. Of I/o's: 22
• Ram Memory Size: 192Byte
• Cpu Speed: 4MHz
• No. Of Timers: 2
• Interface: I2C
• Embedded Interface Type: I2C
• Rohs Compliant: Yes
• Processor Series: PIC14000
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 192 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 1
• Operating Supply Voltage: 2.7 V to 6 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: 0 C
• On-chip Adc: 16 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ISPICR1 - ADAPTER IN-CIRCUIT PROGRAMMING309-1073 - ADAPTER 28-SOIC TO 28-SOIC309-1024 - ADAPTER 28-SOIC TO 28-DIP309-1023 - ADAPTER 28-SOIC TO 28-DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

9.0
The PIC14000 has additional analog modules for
mixed signal applications. These include:
• bandgap voltage reference
• comparators with programmable references
• internal temperature sensor
• voltage regulator control
9.1
The bandgap reference circuit is used to generate a
1.2V nominal stable voltage reference for the A/D and
the low-voltage detector. The bandgap reference is
channel 4 of the analog mux. The bandgap reference
voltage is stored in the calibration space EPROM
(See Table 4-2). To enable the bandgap reference
REFOFF (SLPCON<5>) must be cleared.
9.2
The RA1/AN1 and RA5/AN5 pins have an internal
level-shift network. A current source and resistor are
used to bias the pin voltage by about +0.5V into a range
usable by the A/D converter. The nominal value of bias
current source is 5 A and the resistor is 100 kohms.
The level-shift function can be turned on by clearing the
LSOFF bit (SLPCON<4>) to '0'.
1996 Microchip Technology Inc.
Note:
OTHER ANALOG MODULES
Bandgap Voltage Reference
Level-Shift Networks
The minimum voltage permissible at the
RA1/AN1 and RA5/AN5 pins is -0.3V. The
input protection diodes will begin to turn
on beyond -0.3V, introducing significant
errors in the A/D readings. Under no con-
ditions should the pin voltage fall below
-0.5V.
This document was created with FrameMaker 4 0 4
Preliminary
9.2.1
The RA1/AN1 and RA5/AN5 inputs also have a
matched pair of pass gates useful for current-measure-
ment applications. One gate is connected between the
pin and the level-shift network. The second pass gate
is connected to ground as shown in Figure 9-1. By set-
ting the ADZERO bit (ADCON0<0>), a zero-current
condition is simulated. Subsequent A/D readings are
calculated relative to this zero count from the A/D. This
zeroing of the current provides very high accuracies at
low current values where it is most needed.
For additional noise filtering or for capturing short dura-
tion periodic pulses, an optional filter capacitor may be
connected from the SUM pin to ground (this feature is
available for RA1/AN1 only). This forms an RC network
with the internal 100 kohm (nominal) bias resistor to act
as a low pass filter. The capacitor size can be adjusted
for the desired time constant.
A switch is included between the output from the
RA1/AN1 level-shift network and the SUM pin. This
switch is closed during A/D sampling periods and is
automatically opened during a zeroing operation (if
ADZERO = '1'). If not required in the system, this pin
should be left floating (not connected).
Setting the LSOFF bit (SLPCON<4>) disables the
level-shift networks, so the RA1/AN1 and RA5/AN5
pins can continue to be used as general-purpose ana-
log inputs.
ZEROING/FILTERING SWITCHES
PIC14000
DS40122B-page 65