l9958 STMicroelectronics, l9958 Datasheet - Page 15

• Manufacturer Part Number: l9958
• Description: Low Rdson Spi Controlled H-bridge
• Manufacturer: STMicroelectronics

L9958
3.5
3.6
SPI communication failure
In case of "no SCK edge" when CS = '0', the transfer is considered as valid: no error is
returned to the µC. The answer of last command is sent during next transfer.
When the number of SCK period is different from 0 or multiple of 16, next SPI answer is all
zero.
Figure 10. SPI zero clock communication
5 V and 3.3 V output compatibility
In order to ensure a full compatibility with 5V and 3.3V MCU peripherals, the pin VDDIO is
dedicated to supply the output buffer of SO. The overall current consumption on Vddio is
"Ivddio". A parasitic current from the pin SO could flow through the pin VDDIO in case of
over-voltage on SO pin vs. VDDIO pin.
CS
SO
SI
Answer to cmd N-1
Command N
Doc ID 17269 Rev 1
FSI bit
Answer to cmd N
Command N+1
Device description
AC00682
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