L9945 datasheet(150/151 Pages) STMICROELECTRONICS

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List of figures

Figure 1.

Block diagram .................................................................... 3

Figure 2.

Example of High-Side configuration with NMOS on channel 1.................................... 4

Figure 3.

Example of High-Side configuration with PMOS on channel 5 .................................... 5

Figure 4.

Example of Low-Side configuration with NMOS on channel 3 .................................... 5

Figure 5.

Example of peak & hold configuration with NMOS (HS) on channel 1 and NMOS (LS) on channel 4 ......... 6

Figure 6.

Example of H-Bridge configuration with NMOS as HS and LS transistors (channels 1-4 used) ............. 8

Figure 7.

L9945 pinout ..................................................................... 9

Figure 8.

ESD ratings on pinout .............................................................. 15

Figure 9.

Sketch of a 2s2p PCB with thermal vias .................................................. 16

Figure 10.

Thermal impedance diagram ......................................................... 17

Figure 11.

Charge pump connections ........................................................... 22

Figure 12.

Output pre-driver control ............................................................ 25

Figure 13.

Clamping for HS configuration ........................................................ 26

Figure 14.

Clamping for LS configuration......................................................... 27

Figure 15.

H-bridge driving configurations ........................................................ 30

Figure 16.

OC detection strategies for H-Bridge: (left) one shunt resistor for LS, DSM for HS; (center) two shunt resistors;

(right) DSM ..................................................................... 33

Figure 17.

Current limitation timing diagram....................................................... 34

Figure 18.

Current limitation iterations (until OC failure)............................................... 35

Figure 19.

Possible faults in peak & hold configuration ............................................... 39

Figure 20.

Daisy chain and parallel operation...................................................... 42

Figure 21.

Data transfer in daisy chain operation ................................................... 42

Figure 22.

SPI timing diagram ................................................................ 44

Figure 23.

Out of frame response .............................................................. 44

Figure 24.

NDIS structure ...................................................................118

Figure 25.

BIST & HWSC sequence ........................................................... 120

Figure 26.

NDIS/DIS release after NRES release: tCC is selected as watchdog starting timer value................ 121

Figure 27.

NDIS/DIS release before NRES release: tCC is selected as watchdog starting timer value. Then, CC timer

switches to tCC. ................................................................. 122

Figure 28.

Diagnostic codes quick look ......................................................... 123

Figure 29.

FSM describing diagnostic priority ..................................................... 124

Figure 30.

Overcurrent sensing method (example on a LS NMOS) ...................................... 125

Figure 31.

Rshunt and DSM method diagram .................................................... 126

Figure 32.

TCF vs. Tj ..................................................................... 130

Figure 33.

BCF vs.VPS .................................................................... 131

Figure 34.

OC detection through DSM or Shunt Measurement in Low Side configuration ....................... 132

Figure 35.

OC detection through DSM or Shunt Measurement in High Side configuration with PMOS .............. 133

Figure 36.

Deglitch and settling filter times for OFF state diagnostics: (left) STG detection on LS; (right) STB detection on HS

............................................................................. 135

Figure 37.

OFF state output regulator for OL detection. Example of operation on HS ......................... 137

Figure 38.

OFF state output regulator for OL detection. Example of operation on LS.......................... 137

Figure 39.

Fast charge/discharge currents for OL detection: (left) OL detection on LS; (right) OL detection on HS ..... 138

Figure 40.

TQFP64 (10x10x1 mm exp. pad down) package outline...................................... 141

L9945

List of figures

DS12275 - Rev 8

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