L9935(1999) Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
L9935 Datasheet PDF : 19 Pages
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L9935
Test condition for all propagation times (unless otherwise specified)
HIGH ≥ 3V; LOW ≤ 0.8V; tr, tf = 10ns, Enable: ENN Low < 0.8V, ENN High > Vcc -0.8V
Symbol
fSCLK
t1
tch
tcl
tsu
tsh
td
tzc
ten_sck
tpd
Parameter
SCK-Frequency
SCK stable before and after
CSN = 0
Width of SCK high pulse
Width of SCK low pulse
SDI setup time
SDI hold time
SDO delay time (CL = 50pF)
SDO high Z CSN high
Setup time ENABLE to SCK
Propagation delay SPI to
output QXX
Test Conditions
HIGH > VCC -1.2V
Min.
DC
100
Typ. Max. Unit
2MHz
ns
200
ns
200
ns
80
ns
80
ns
100
ns
100
ns
30
µs
2 (*)
µs
(*) Measured at a transition from High impedance (Bridge off) to bridge on. (Reversing polarity takes about 1µs longer because the bridge first
turns off before turning on in reverse direction).
Table of bits
bit5,bit4
bit3
bit2,bit1
bit0
bit7,bit6
: current range of bridge A (Outputs A1 and A2)
: polarity of bridge A
: current range of bridge B (Outputs B1 and B2)
: polarity of bridge B
: Error1 and Error 2
Cascading several Devices
Cascading several devices can be done using the SDO output to pass data to the next device. The
whole frame now consists of n byte. n is the number of devices used.
Figure 8. Cascading Several Stepper motor drivers.
SDO
no.1
SDI
SDO
no.2
SDI
SDO
no.3
SDI
SDO
µP
CSN SCK
SCK CSN
SCK CSN
SCK CSN
Figure 9. Control sequence for 3 Stepper motor drivers.
EN
CSN
SCK
SDO
of µP
byte for no. 3
byte for no. 2
QXX
D99AT438
byte for no. 1
D99AT439
13/19
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