MAX17843 datasheet(7/131 Pages) MAXIM

7 / 131 page

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

www.maximintegrated.com

Maxim Integrated │ 7

Figure 1. Simplified Operating Circuit ..............................................................11

Figure 2. Cell and switch input Filter Operating Circuit ................................................ 12

Figure 3. MAX17843 Functional block diagram...................................................... 13

Figure 4. MAX17843 64-Pin LQFP Pin Configuration ................................................. 21

Figure 5. ESD Diode Diagram ................................................................... 25

Figure 6. Analog Front-End (AFE Inputs) .......................................................... 26

Figure 7. VBLKP Measurement ................................................................... 28

Figure 8. Auxiliary Measurement ................................................................. 29

Figure 9. Auxiliary Application Circuit ............................................................. 29

Figure 10. Die Temperature Measurement ......................................................... 31

Figure 11. IIR Filter Block Diagram ............................................................... 33

Figure 12. IIR Flowchart with Respect to the AMENDFILT Bit .......................................... 34

Figure 13. IIR Filter Diagram with Respect to RDFILT ................................................ 35

Figure 14. Logic Diagram when Balancing Switches Are Disabled....................................... 36

Figure 15. Acquisition Mode Flowchart ............................................................ 37

Figure 16. Acquisition, OVSAMP[2:0]=0h and SCANMODE=0.......................................... 38

Figure 17. Acquisition, OVSAMP[2:0] > 0 and SCANMODE=0 .......................................... 38

Figure 18. Cell Voltage-Alert Thresholds............................................................41

Figure 19. Internal Cell Balancing .................................................................41

Figure 20. Cell-Balancing Watchdog .............................................................. 42

Figure 21. Low-Voltage Regulator ................................................................ 44

Figure 22. HV Charge Pump .................................................................... 45

Figure 23. SHDNL Charge Pump ................................................................ 46

Figure 24. Power-On Sequence.................................................................. 47

Figure 25. Shutdown Sequence.................................................................. 48

Figure 26. Power-On and Shutdown Timing (UART Control) ........................................... 49

Figure 27. Shutdown Timing (Software Control) ..................................................... 49

Figure 28. System Data Flow.................................................................... 50

Figure 29. UART Transmitter .................................................................... 51

Figure 30. UART Receiver...................................................................... 52

Figure 31. Command Packet .................................................................... 54

Figure 32. Preamble Character .................................................................. 54

Figure 33. Data Characters ..................................................................... 55

Figure 34. Stop Character ...................................................................... 56

Figure 35. Communication Mode................................................................. 56

Figure 36. ALTREF Diagnostic .................................................................. 66

Figure 37. VAA Diagnostic ADC1 ................................................................. 67

LIST OF FIGURES

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