Low Power, Low System Cost
80C51 MCU with ADC and PWM
P87LPC768
As a member of the 51LPC microcontroller family, the 87LPC768
offers an 8-bit ADC with four multiplexed channels and an 8-bit
Pulse Width Modulator (PWM.) Further, the device provides 4K
of OTP code memory and 128 bytes of data SRAM, making it
suitable for high-level programming. The code memory is In-System
Programmable (ISP) through a serial interface. Other embedded
features that reduce the need for external components are brownout
detection, power-on reset and an on-chip RC oscillator that is very
stable over temperature and voltage.
The MCU core is fully compatible with the industry-standard C51
core, but features a 2X speed mode, where the CPU clock is divided
by 6 instead of 12. At 20 MHz, the 51LPC family devices provide
a throughput identical to a conventional C51 running at 40 MHz,
thus minimizing EMI and power consumption. The 87LPC768 is
manufactured in Philips Semiconductor鈥檚 low-power CMOS tech-
nology and is well suited for use in battery powered applications.
At 32kHz, the device consumes only 16碌A and the operating volt-
age ranges from 2.7 鈥?6.0V (3.0 鈥?6.0V for analog peripherals). A
fixed-frequency oscillator running at 6 MHz can be used to clock
the device in applications that do not require the high accuracy of
a crystal. Regardless of the clock source used, the user can reduce
operating frequency down to as much 1/512 of the source frequen-
cy, allowing the user to optimize performance and power consump-
tion on-the-fly. Use of the on-chip power-on reset and oscillator
makes up to 18 I/O pins available to the user, leaving only two
non-I/O pins for connection to power and ground.
Because the P87LPC768 combines an embedded ADC and PWM,
it is especially useful in applications that include dynamic position-
ing, speed and temperature control. The PWM provides very
high flexibility since the output resolution can be configured to
any number of bits up to 10.
The device comes with extensive serial communication capabilities.
On-chip UART provides serial communications for RS-232 and
RS-485. The I
2
C interface provides interface to other I
2
C units
such as serial EEPROMs, other MCUs and a variety of peripheral
devices. These communications interfaced in combination with
the analog capabilities makes the 87LPC768 ideal for a variety of
sensor applications.
The P87LPC768 is available in 20-pin SOIC and PDIP packages
Key Features
鈥?/div>
鈥?/div>
4-channel Pulse Width Modulator (PWM) generator
鈥?Configurable resolution 1 鈥?10 bits
4-channel, 8-bit Analog-to-Digital Converter
鈥?9.3 microseconds conversion time at 20 MHz
鈥?100% accelerated C51 CPU core runs at 6 clocks
per instruction
20 MHz maximum operating frequency 4.5 鈥?6.0V and
10 MHz maximum operating frequency 2.7 鈥?6.0V
Configurable brownout reset detector
On-chip serial communications interfaces
鈥?UART
鈥?I
2
C
Five I/O pin modes, individually selectable for each pin
鈥?Quasi bi-directional
鈥?Push-pull output
鈥?Open drain output
鈥?Input
鈥?Schmitt trigger input
Up to 18 pins usable for general purpose I/O
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Ordering Information
Part Number
P87LPC768BN
P87LPC768BD
P87LPC768FN
P87LPC768FD
Temperature (C)
0 to +70
0 to +70
鈥?0 to +85
鈥?0 to +85
Package Description
Plastic Dual In-Line [PDIP20]
Plastic Small Outline [SOIC20]
Plastic Dual In-Line [PDIP20]
Plastic Small Outline [SOIC20]
Operating Frequency
All devices operate at
20MHz @ 4.5 to 6.0V
10MHz @ 2.7 to 6.0V
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