L6460 STMicroelectronics, L6460 Datasheet - Page 41

• 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

L6460
8.3
8.4
8.5
8.6
8.6.1
Slave device mode
In slave device mode, L6460 consider the nAWAKE pin as an input enable. Since this is now
a digital pin, the current pull up source inside the nAWAKE circuit is disabled.
At the startup, if the nAWAKE pin is found to be low for a period higher than t
L6460 enters directly in the “Low Power mode”; when nAWAKE pin is pulled high for a
period higher than t
Master device mode
In master device mode, L6460 begins its start up procedure without waiting for any external
enable signal and it uses GPIO[5] pin to drive the nAWAKE pin of Slave devices.
During the whole start up time, it forces its GPIO[5] pin at logic level “0” in order to maintain
all slave devices in “Low Power mode” as previously described. When start up operations
are completed, L6460 forces the GPIO[5] output to logic level “1” to enable the slave devices
and keeps GPIO[5] output at high level until it senses an under-voltage on any of its System
regulators. If firmware writes in the PwrCtrl register to set Master L6460 in “Low Power
mode” it immediately forces GPIO[5] output to logic level “0” to force the slave devices to
enter in “Low Power mode”, then it waits for T
mode” sequence.
Single device mode
In single device mode, the device behaves similarly to master device mode but:
1.
2.
Sub-configurations for slave, master or single device modes
Each slave, master or single device modes can be divided in other minor modes depending
on the start-up sequence needed for L6460 internal regulators.
Unless otherwise specified, in all the following modes the regulators included in the start up
sequence are considered system regulators and they start in the sequence indicated.
Bridge mode
In this configuration bridges 3 and 4 are not used as regulators and therefore can be
configured by the firmware in any of their possible bridge modes.
When in this mode the power-up sequence is:
1.
2.
It doesn’t use the GPIO[5] pin to drive slave devices.
It doesn’t wait for T
Main switching regulator (V
Main linear regulator (V
AWAKEFILT
MASTWAIT
LINmain
, L6460 begins its start up procedure.
Doc ID 17713 Rev 1
SWmain
before entering in “Low Power mode”.
).
).
MASTWAIT
time and it starts its “Low Power
Start-up configurations
AWAKEFILT
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