L9958SBTR STMicroelectronics, L9958SBTR Datasheet

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Features ■ Programmable current regulation peak threshold by SPI up to 8.6 A typ. ■ Operating battery supply voltage 4 ■ Operating V supply voltage 4 5 ■ All pins withstand 19 ...

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Contents Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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L9958 5.2.6 5.2.7 5.2.8 5.2.9 5.3 Off-state diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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List of tables List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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L9958 List of figures Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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Block diagram 1 Block diagram Figure 1. Block diagram 6/38 Doc ID 17269 Rev 2 L9958 ...

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L9958 2 Pins description 2.1 PowerSO-20 The exposed slug must be soldered on the PCB and connected to GND. Table 2. PowerSO-20 pin function Pin N° ...

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Pins description 2.2 PowerSO16 The exposed slug must be soldered on the PCB and connected to GND Table 3. PowerSO16 pin function Pin Nº ...

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L9958 2.3 PowerSSO24 Although this package has two separate pins for the ground (pin11 = PGND = Power Ground and pin22 = GND = Logic Ground), the device is designed to work with shortening ground and is mandatory that the ...

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Device description 3 Device description 3.1 Supply range The L9958 has an operating supply range from "Vs_uv" (battery monitoring However, the device is tested until 16 V; the functionality of the device is guaranteed until 28 ...

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L9958 3.2.2 DIR and PWM inputs The pins DIR and PWM are internally pulled down. The bridge is controlled by these two inputs according to the table below. Table 6. Control pins DIR, PWM DIR Figure ...

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Device description 3.3 Serial peripheral interface (SPI) The SPI is used for bidirectional communication with a control unit, allowing IC configuration, diagnosis and identification. L9958 can also be used in daisy-chain configuration (number of device in the daisy chain is ...

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L9958 Table 7. Configuration protocol (CFG_REG) Bit 0 - LSB ISR_DIS 15-MSB Table 8. Diagnosis protocol (DIA_REG) Bit Name 0-LSB OL_OFF Open Load in OFF condition ...

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Device description 3.3.1 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. Daisy chain topology 3.4 ...

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L9958 3.5 SPI communication failure In case of "no SCK edge" when CS = '0', the transfer is considered as valid: no error is returned to the µC. The answer of last command is sent during next transfer. When the ...

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Current regulation 4 Current regulation To protect the actuator and limit power dissipation, a two-level chopper current limitation is integrated as shown in figure below. The current is measured by sense cells integrated in the low-side switches. As soon the ...

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L9958 Figure 12. Temperature dependent current regulation 4.2 Current regulation with low-inductive loads Each time output stages are turned off, an internal timing starts for duration Toff-min. Whenever turn-on is reached in a time Toff that is shorter than Toff-min, ...

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Current regulation selection can be done "on the fly" by SPI. The corresponding bits are called "VSR" and "ISR". No external component is needed to select the slew rate range. Only the power transistors not used for freewheeling can be ...

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L9958 5 Diagnostics and protections A detailed diagnostic of the H-bridge is available through SPI communication. The 16 bits diagnostic word is sent back to the MCU in return of a command word. The diagnostic word is used to report ...

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Diagnostics and protections 5.2 Protection and on state diagnostics L9958 is protected against short circuits, overload and invalid supply voltage by the following measures. 5.2.1 Over-current on high-side - short to ground The high-side switches are protected against a short ...

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L9958 This disable the turning on of the low-side drivers during current recirculation. The current flows through the body diode of the low-side MOS for a fixed time. At the end of this fixed time the Vout voltage is sampled ...

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Diagnostics and protections Figure 17. Battery voltage monitoring Table 13. Vs under-voltage VS_UV 1 0 (default) 5.2.7 Vdd over-voltage detection Although the Vdd input pin and all I/O's are able to withstand over-voltage circuitry is ...

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L9958 5.3 Off-state diagnosis This diagnostic is performed in any off-state condition, just after ignition key-on or during an off-state phase occurring after an on-state phase of the bridge. 5.3.1 Off-state detection scheme In order to avoid any wrong diagnostic, ...

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Diagnostics and protections Figure 20. Off-state diagnostic principle 5.4 H-Bridge functional status Three bits in the diagnosis register are used to give a feedback about the state of the H- Bridge. Status are Current Limitation (bit 4 "C_LIM"), Temperature Warning ...

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L9958 6 Electrical specifications 6.1 Absolute maximum ratings The component must withstand the overall following stimulus without any damage or latch- up. Beyond these values, damage to the component may occur. Table 15. Absolute maximum ratings Symbol Parameter V Supply ...

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Electrical specifications Figure 21. Thermal impedance (junction-ambient) of power packages 6.3 Range of functionality Within the range of functionality, all L9958 functionalities have to be guaranteed. All voltages refers to GND. Currents are positive into and negative out of the ...

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L9958 6.4 Electrical characteristics T = -40 °C ... 125 °C unless otherwise specified, case V = 4.5 V ... 5.5 V unless otherwise specified ... 28 V unless otherwise specified ps All voltages refer ...

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Electrical specifications 6.4.3 SPI Table 20. SPI Pos. Symbol Parameter Clock frequency (50 % duty 3.1 f spi cycle) 3.2 T SDO transition speed, 20-80 % sdo_trans 3.3 T Minimum time SCLK = HIGH clh 3.4 T Minimum time SCLK ...

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L9958 6.4.4 Digital inputs: TTL // 3. CMOS compatible Table 21. Digital inputs: TTL // 3. CMOS compatible Pos. Symbol Parameter 4.1 V Input voltage HIGH ih 4.2 V Input voltage LOW il 4.3 Hysteresis of ...

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Electrical specifications 6.4.6 Over-temperature monitoring Table 23. Over-temperature monitoring Pos. Symbol Parameter 6.1 OTwarn Over-temperature warning 6.2 OTsd Over-temperature shut-down 6.3 OThyst Over-temperature hysteresis 6.4 T Over-temperature filtering time TSD 6.4.7 Current limitation and over-current detection Table 24. Current limitation ...

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L9958 Table 24. Current limitation and over-current detection (continued) Pos. Symbol Parameter Ioc_ls Ioc-hs Low-side over-current threshold 7.7 High-side over-current threshold Tracking Low-side & high-side Toc_ls 7.8 over-current detection Toc_hs filtering time 6.4.8 Diagnostic of open-load in on-state Table 25. ...

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Electrical specifications 6.4.10 Timing characteristics Table 27. Timing characteristics Pos. Symbol Parameter 10.1 f PWM frequency pwm T Delay time for switch-on don 10.2 T Delay time for switch-off doff ΔT Delay time: symmetry d 10.3 T Disable delay time ...

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L9958 7 Application circuit Figure 22. Application circuit Doc ID 17269 Rev 2 Application circuit 33/38 ...

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Package information 8 Package information In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ...

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L9958 Figure 24. PowerSO16 mechanical data and package dimensions Doc ID 17269 Rev 2 Package information 35/38 ...

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Package information Figure 25. PowerSSO24 mechanical data and package dimensions Dim. Min 2. 0.33 c 0.23 (1) 10.10 D (1) 7. 10. 0. ...

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L9958 9 Revision history Table 28. Document revision history Date 16-Mar-2010 08-Apr-2011 Revision 1 Initial release. 2 Updated Table 27: Timing characteristics on page 32 Doc ID 17269 Rev 2 Revision history Changes (Pos. 10.8). 37/38 ...

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