STM32F401CB datasheet(101/134 Pages) STMICROELECTRONICS

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STM32F401xB STM32F401xC

Electrical characteristics

113

I2S interface characteristics

Unless otherwise specified, the parameters given in Table 62 for the I2S interface are

derived from tests performed under the ambient temperature, fPCLKx frequency and VDD

supply voltage conditions summarized in Table 14, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5VDD

Refer to Section 6.3.16: I/O port characteristics for more details on the input/output alternate

function characteristics (CK, SD, WS).

Note:

Refer to the I2S section of the reference manual for more details on the sampling frequency

(FS).

fMCK, fCK, and DCK values reflect only the digital peripheral behavior. The values of these

parameters might be slightly impacted by the source clock precision. DCK depends mainly

on the value of ODD bit. The digital contribution leads to a minimum value of

(I2SDIV/(2*I2SDIV+ODD) and a maximum value of (I2SDIV+ODD)/(2*I2SDIV+ODD). FS

maximum value is supported for each mode/condition.

Table 62. I2S dynamic characteristics(1)

Symbol

Parameter

Conditions

Min

Max

Unit

fMCK

I2S Main clock output

256x8K

256xFs(2)

MHz

fCK

I2S clock frequency

Master data: 32 bits

64xFs

MHz

Slave data: 32 bits

64xFs

DCK

I2S clock frequency duty cycle Slave receiver

tv(WS)

WS valid time

Master mode

th(WS)

WS hold time

Master mode

tsu(WS)

WS setup time

Slave mode

th(WS)

WS hold time

Slave mode

tsu(SD_MR)

Data input setup time

Master receiver

7.5

tsu(SD_SR)

Slave receiver

th(SD_MR)

Data input hold time

Master receiver

th(SD_SR)

Slave receiver

tv(SD_ST)

th(SD_ST)

Data output valid time

Slave transmitter (after enable edge)

tv(SD_MT)

Master transmitter (after enable edge)

th(SD_MT)

Data output hold time

Master transmitter (after enable edge)

2.5

1. Guaranteed by characterization.

2. The maximum value of 256xFs is 42 MHz (APB1 maximum frequency).

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