l9958 STMicroelectronics, l9958 Datasheet - Page 14

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

Device description
3.3.1
3.4
14/38
Daisy chain operation
Several L9958 can be connected to one SPI connection in daisy chain operation to save µC
interface pins. The number of devices connected in daisy chain is unlimited.
Figure 8.
SPI timing
Figure 9.
SCK
SO
CS
SI
Daisy chain topology
SPI timing
t
t
sclch
csdv
t
hclcl
reads from IC A--C
SI
FSI
SCK
t
shift register
pcld
reads from IC D-E
IC A
SI
Doc ID 17269 Rev 1
SO
t
t
clh
scld
CS1
LSB
reads from IC F
CS2
shift register
SO
IC D
Three devises in one daisy chain
LSB
Two devises in one daisy chain
SI
SCK
SI
CS1: low for 48 clocks SCK
CS2: low for 32 clocks SCK
CS3: low for 16 clocks SCK
SCK
t
hcld
SCK
CS3
CS1
SO
shift register
single chain
shift register
shift register
IC B
t
IC F
cll
CS2 CS3
µC
CS1
SCK
SI
writes from IC F
SO
CS2
shift register
DO
IC E
SI
writes from IC D-E
SCK
SCK
SI
shift register
SO
IC C
writes into IC A--C
CS1
MSB
AC00659
SO
MSB
t
sclcl
t
pchdz
t
hclch
t
CNNCS
AC00660
L9958