L6460 STMicroelectronics, L6460 Datasheet - Page 90

• Manufacturer Part Number: L6460
• Description: MOSFET & Power Driver ICs SPI Config Stepper DC Multi Motor DRV
• Manufacturer: STMicroelectronics
• Type: Full-Bridge Driverr

Specifications of L6460

• Product: Half-Bridge Drivers
• Rise Time: 0.4 us
• Fall Time: 0.4 us
• Supply Voltage (max): 38 V
• Supply Voltage (min): 13 V
• Supply Current: 11 mA
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 4
• Output Current: 10 mA
• Output Voltage: 30 V
• Package / Case: TQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

General purpose PWM
19
19.1
19.2
90/139
General purpose PWM
L6460 includes three general purpose PWM generators that can be redirected on GPIO
pins (see
a fixed period F
has a programmable base time clock and a programmable time for both high and low levels.
General purpose PWM generators 1 and 2 (AuxPwm1 and
AuxPwm2)
The Duty cycle of these PWM generators can be changed by writing the AuxPwmXCtrl bits
(where X can be 1 or 2) in the AuxPwm1Ctrl and AuxPwm2Ctrl registers. Their positive duty
cycle will change according to the equation:
According to this equation a programmed “0” value will cause a 0% duty cycle (output
always at logic level 0).
Programmable PWM generator (GpPwm)
GpPWM has a programmable base clock that can be changed by programming the
GpPwmBase[6:0] bits in the GpPwmBase register. The clock will change according to the
equation:
The high and low level duration (expressed in base clock periods), can be programmed
writing the GpPwmHigh[7:0] and GpPwmLow[7:0] bits in the GpPwmCtrl register so they will
change according to following equations:
The resulting period of the PWM will be:
and the positive duty cycle will result:
A programmed value of 0 in GpPwmHigh[7:0] and GpPwmLow[7:0] bits will force the PWM
generator output to be always at logic level “0”.
DutyCycle
Chapter
Period
=
OSC
High_level_Time
Low_level_Time
---------------------------------------------------------------------------------------------- -
High_level_Time
=
22). Two of these generators (Aux_PWM_1 and Aux_PWM_2) work with
PWM_BASE_PERIOD
/512 and have a programmable duty cycle; the other one (GP_PWM)
(
GpPwmHigh 7:0
High_level_Time
PWM_X_DUTY
Doc ID 17713 Rev 1
+
=
=
[
Low_level_Time
GpPwmHigh 7:0
GpPwmLow 7:0
]
+
GpPwmLow 7:0
=
=
(
AuxPwmXCtrl 9:0
GpPwmBase 6:0
[
[
=
]
] PWM_BASE_PERIOD
-------------------------------------------------------------------------------------------------------- -
GpPwmHigh 7:0
×
[
×
PWM_BASE_PERIOD
]
[
[
)
+
PWM_BASE_PERIOD
]
]/512
+
GpPwmHigh 7:0
1
) Tosc
[
×
]
+
GpPwmLow 7:0
[
]
[
L6460
]