The requested file:
https://pdf.datasheetcatalog.com/datasheets/stmicroelectronics/STM32F031C4_STM32F031C4T6_STM32F031C4T6TR_STM32F031C6_to_STM32F031K6U7.pdf
is the data sheet for the following electronic components:

ST Microelectronics

#	Part Name	Description
1	STM32F031C4	Entry-level ARM Cortex M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
2	STM32F031C4T6	Entry-level ARM Cortex M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
3	STM32F031C4T6TR	Entry-level ARM Cortex M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
4	STM32F031C6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 18 MHz CPU, motor control
5	STM32F031C6T6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 18 MHz CPU, motor control
6	STM32F031C6T6TR	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 18 MHz CPU, motor control
7	STM32F031C6T7	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 18 MHz CPU, motor control
8	STM32F031F4	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
9	STM32F031F4P6	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
10	STM32F031F4P7	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
11	STM32F031F6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
12	STM32F031F6P6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
13	STM32F031F6P7	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
14	STM32F031F6P7TR	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
15	STM32F031G4	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
16	STM32F031G4U6	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
17	STM32F031G4U6TR	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
18	STM32F031G4U7	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
19	STM32F031G4U7TR	Entry-level ARM Cortex-M0 MCU with 16 Kbytes Flash, 48 MHz CPU, motor control
20	STM32F031G6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
21	STM32F031G6U6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
22	STM32F031G6U6TR	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
23	STM32F031G6U7	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
24	STM32F031K4	Entry-level ARM Cortex-M0 MCU with 16 kbytes Flash, 48 MHz CPU, motor control
25	STM32F031K4U6	Entry-level ARM Cortex-M0 MCU with 16 kbytes Flash, 48 MHz CPU, motor control
26	STM32F031K6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
27	STM32F031K6T6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
28	STM32F031K6T7	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
29	STM32F031K6U6	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control
30	STM32F031K6U7	Entry-level ARM Cortex-M0 MCU with 32 Kbytes Flash, 48 MHz CPU, motor control

Select the part name and then you can download the datasheet in PDF format.