Features: `4.5V to 5.5V Supply Operating Range
`Operates at 8.664MHz Oscillator Frequency for RDS compatibility
`Fully Static operation
`-40°C to + 85°C Maximum Operating Temperature Range
`Run, Wait, Slow, Halt and RAM Retention modes
` User ROM: 48 Kbytes
`Data RAM: 3 Kbytes, including 128 byte stack
`80 pin plastic package
` 62 multifunctional bidirectional I/O lines:
Programmable Interrupt inputs on some I/Os
8 Analog inputs
EMI filtering
`Two 16-bit Timers, each featuring:
2 Input Captures
2 Output Compares
External Clock input (on Timer A)
PWM and Pulse Generator modes
`RDS Radio Data System Filter, Demodulator and GBS circuits
`8-bit Analog-to-Digital converter with 8 channel analog multiplexer
`Digital Watchdog
`Two SPI Serial Peripheral Interfaces
`SCI Serial Communications Interface
`Full I2C multiple Master/Slave interface
`2KHz Beep signal generator
`Master Reset and Power-On Reset
`8-bit Data Manipulation
`63 Basic Instructions
`17 main Addressing Modes
`8 x 8 Unsigned Multiply Instruction
`True Bit Manipulation
`Complete Development Support on PC/DOS/WindowsTM Real-Time Emulator
` Full Software Package (C-Compiler, Cross-Assembler, Debugger)Pinout
SpecificationsDevices of the ST72 family contain circuitry to protect the inputs against damage due to high static voltage or electric fields. Nevertheless, it is recommended that normal precautions be observed in order to avoid subjecting this high-impedance circuit to voltages above those quoted in the Absolute Maximum Ratings. For proper operation, it is recommended that VIN and VOUT be constrained within the range:VSS 3 VIN and VOUT 3 VDD
To enhance reliability of operation, it is recommended to configure unused I/Os as inputs and to connect them to an appropriate logic voltage level such as VSS or VDD.
All the voltage in the following tables are referenced to VSS.
Stresses above those listed as "Absolute Maximum Ratings" may cause permanent damage to the device. Functional operation of the device at these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
| Symbol |
Ratings |
Value |
Unit |
| VDD/VDDA/VDDP |
Supply Voltage |
0.3 to +6 |
V |
| |VDDA -VDD| |
Supply Voltage |
< 50 |
mV |
| VIN |
Input Voltage |
VSS - 0.3 to VDD + 0.3 |
V |
| IVDD - IVSS |
Total current into VDD/VSS pins |
50/20 |
mA |
| I |
Current Drain per Pin Excluding
VDD and VSS |
20 |
mA |
| TA |
Maximum Operating Temperature
Range |
TL to TH
-40to +85 |
°C |
| TSTG |
Storage Temperature Range |
-65 to +150 |
°C |
| VHV |
High voltage on pins PH3, PH4,
PH5 |
10 |
V |
DescriptionThe ST7285C HCMOS Microcontroller Unit is a member of the ST7 family of Microcontrollers dedicated to car radio applications with RDS capability. The device is based on an industry-standard 8- bit core and features an enhanced instruction set. The device is normally operated at an 8.664MHz oscillator frequency for RDS compatibility but, thanks to the fully static design, operation is possible down to DC, when RDS functionality is not required. Under software control, theST7285C may be placed in either WAIT, SLOW or HALT modes, thus reducing power consumption. The enhanced instruction set and addressing modes afford real programming potential. In addition to standard 8- bit data management, the ST7285C features true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes. The device includes an on-chip oscillator, CPU, ROM, RAM, 62 I/O lines and the following on-chip peripherals: Analog-to-Digital converter (ADC), two industry standard SPI serial interfaces, a Serial Communications Interface, an I2C interface, a digital Watchdog Timer, two independent 16-bit Timers, one featuring an External Clock Input, and both featuring Pulse Generator capabilities, 2 Input Captures and 2 Output Compares. RDS Filter, Demodulator and GBS circuitry for car radio applications is also included.
ST7285C Data Sheet
