Document
L9958
Low RDSON SPI controlled H-Bridge
'!0'03
PowerSO-20
'!0'03
PowerSSO24
'!0'03
PowerSO16
Features
Programmable current regulation peak threshold by SPI up to 8.6 A typ.
Operating battery supply voltage 4.0 V to 28 V Operating Vdd supply voltage 4.5 V to 5.5 V All pins withstand 19 V, Vs and output pins
withstand 40 V Full path Ron from 100 mΩ (at Tj = -40 °C) to
300 mΩ (at Tj =150 °C) Logic inputs TTL/CMOS-compatible Operating frequency up to 20 kHz 16-bit SPI interface for
configuration/diagnostics, daisy chain capability Over temperature and short circuit protection VS undervoltage disable function Vdd undervoltage and overvoltage protection Vdd overvoltage detection Open-load detection in ON condition Full diagnostics in OFF state Enable and disable input Low stand by current (<10 μA) Voltage and current slew-rate control for low EMI, programmable through SPI Available in three power packages
Description
The L9958 is an SPI controlled H-Bridge, designed for the control of DC and stepper motors in safety critical applications and under extreme environmental conditions.
Datasheet - production data
The H-Bridge is protected against over temperature, short circuits and has an undervoltage lockout for all the supply voltages Vs and Vdd, and for overvoltage on Vdd. All malfunctions cause the output stages to go tristate.
Detailed failure diagnostics on each channel is provided via SPI: short circuit to battery, short circuit to ground, short circuit overload, over temperature.
Open-load can be detected in ON condition, for the widest application ranges. Current regulation threshold can be set by SPI from 2.5 A to 8.6 A (Typ.), in 4 steps. Guaranteed accuracy is ±10 % on all temp range, using an external reference resistor with 1% accuracy over all temp range.
Current limitation threshold is linearly reduced by temperature over 165 °C.and a thermal warning bit is set by SPI. The H-Bridge contains integrated free-wheel diodes. In case of free-wheeling condition, the low side transistor is switched on in parallel of its diode to reduce power dissipation.
A multiple wire bonding technique, as well as ST proprietary package design is making L9958 compatible with three power packages, for maximum flexibility:
PowerSO-20 package (medium power, JEDEC standard MO166);
PowerSO16 package (medium power, lower cost);
PowerSSO24 package (low power, very low cost JEDEC standard MO271A).
Table 1. Device summary
Order code
Package
Packing
L9958
PowerSO-20
Tube
L9958SB
PowerSO16
Tube
L9958XP
PowerSSO24
Tube
December 2013
This is information on a product in full production.
DocID17269 Rev 6
1/38
www.st.com
Contents
Contents
L9958
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 PowerSO-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 PowerSO16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 PowerSSO24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 Supply range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Control inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.1 DI and EN inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2.2 DIR and PWM inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 Serial peripheral interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3.1 Daisy chain operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.4 SPI timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.5 SPI communication failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.6 5 V and 3.3 V output compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.1 Temperature-dependent current regulation . . . . . . . . . . . . . . . . . . . . . . . 16 4.2 Current regulation with low-inductive loads . . . . . . . . . . . . . . . . . . . . . . . 17 4.3 Slew rate control in case of current limitation on low-side . . . . . . . . . . . . 17
5 Diagnostics and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.1 Diagnosis reset strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.1 Reset requests . . . ..