STMicroelectronics ST7FLIT15BF1B6

Overview

ST7FLIT15BF1B6 from STMicroelectronics is an 8-bit Flash microcontroller featuring 4 KB XFlash program memory, 256 bytes RAM, 128 bytes data EEPROM, 10-bit ADC with integrated op-amp, dual 12-bit auto-reload timers (4 PWM outputs), SPI interface, and analog comparator - deployed in industrial sensor nodes requiring low-power, mixed-signal control with on-chip signal conditioning.

For engineers reviewing the ST7FLIT15BF1B6 datasheet, ST7FLIT15BF1B6 pinout, ST7FLIT15BF1B6 application, or ST7FLIT15BF1B6 equivalent, key selection criteria include its 2.7–5.5 V operating range, 8 MHz max CPU frequency (with PLL x4/x8), 17 I/O lines (7 high-sink), and integrated 1% RC oscillator enabling standalone timing without external crystal.

Technical Context

The ST7FLIT15BF1B6 implements an enhanced ST7 8-bit core with 63 instructions, 17 addressing modes, and hardware 8×8 unsigned multiply. Its clock system integrates a factory-trimmed 1% internal RC oscillator, optional PLL (x4/x8), and support for external crystal/resonator up to 16 MHz.

Peripheral architecture includes two independent 12-bit auto-reload timers delivering four PWM outputs and input capture, a dedicated Lite Timer with watchdog, SPI master/slave mode with programmable phase/polarity, and a 10-bit ADC with fixed-gain op-amp supporting 7 analog inputs and dual-range conversion (13-bit precision for 0–430 mV, 10-bit for 430 mV–5 V at 5 V_DD).

Key Specifications

Pinout & Package

ST7FLIT15BF1B6 is packaged in a 20-pin SOIC (SO20 300 mil) with 0.6 mm pitch, compliant with JEDEC MS-013AC. Pin functions are validated per ST's official datasheet Rev 6 (June 2008), Figure 2 and Table 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with STM8S003F3P6 and EFM8BB10F8G-A-QFN20, the ST7FLIT15BF1B6 uniquely combines integrated op-amp, high-sink I/O, and Flash endurance in a mature, cost-optimized 8-bit platform - making it optimal for analog-intensive, low-volume industrial controls where design stability matters more than raw speed.

Availability

ST7FLIT15BF1B6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat control, PLC I/O modules, and energy meter front-ends requiring stable component supply and long-term manufacturability.

Supply support for ST7FLIT15BF1B6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for automotive, industrial, and consumer markets.

The ST7LITE1xB family was engineered for cost-sensitive, low-power embedded applications demanding integrated analog peripherals, robust Flash reliability, and minimal external components - targeting industrial automation, appliance control, and metering.

FAQ

Does ST7FLIT15BF1B6 support In-Application Programming (IAP)?

Yes. The device supports byte-by-byte IAP via its XFlash memory, allowing firmware updates while the application runs. This requires configuring the ICC interface and using ST's proprietary IAP routines - verified in Section 4.3 of the datasheet Rev 6. No external programming voltage is needed; operation occurs at standard VDD.

What is the maximum ADC sampling rate achievable?

The 10-bit ADC achieves up to 100 kSPS under typical conditions (VDD = 5 V, f_CLK = 8 MHz). Conversion time is 13 clock cycles per sample, and the ADC clock is derived from the system clock divided by a programmable prescaler - confirmed in Section 13.11 of the datasheet.

Can the internal 1% RC oscillator be used as the sole clock source?

Yes. The internal 1% RC oscillator (1 MHz nominal) is factory-trimmed and fully functional as the primary clock source. It eliminates the need for external crystals in cost-sensitive designs and supports all five power-saving modes - detailed in Section 7.1 and Table 13 of the datasheet.

Is there hardware support for SPI slave select (SS) deassertion timing?

Yes. PB0 doubles as SS (active-low) in SPI slave mode and features automatic hardware-controlled deassertion synchronized to the SPI clock edge. This ensures glitch-free SS transitions during multi-byte transfers - documented in Section 11.4 and Figure 47 of the datasheet.