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Our customer is considering adoption the DRV2625 for next resonant device module.Few days ago, they obtained the DRV2625-EVM, and connected with their resonant device. The resonant device resonant frequency is 100Hz, resonant impedance is about 15-ohm.Initially, auto-calibration process is not Done, and GUI status collar is Red. Resonant frequency was been set to maximum.I suggested register address 0x2A value to modify from default to 0x02. PROCESS_DONE flag is "1".However, the resonance frequency was set to the maximum without changing.With other resonant device connected, DRV2625-EVM is indicates a normal value.
Q:Does TI grasp similar case?:Does the DRV2625 have restrictions on the impedance of resonant devices?:If TI has idea for resolv, please let us know it.
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In reply to Luis Fernando Rodríguez S.:
In reply to ACGUY:
Hello Luis, I confirmed parasitic capacitance of customer's LRA. f0=around 80-Hz, L0=0.07H at resonant, Z=15-ohm without resonant. => C0=around 56uF!! Too large!!! Does TI have an appropriate haptic driver for this resonant device?orDoes TI think that DRV2604L can operate this resonant device? Regards, ACGUY
LRA_Z and_C.pdfHello Luis,
Customer measred the AC charactics for 2-types LRA. Please see the attached file. Type LVC : Parasitic capacitance = 56uFType USZ : Parasitic capacitance = 1.2uFDevice spec : max 100pF
I was sent your advice to customer."Address 0x27 : Default value 0x10h -> 0x9Fh""Address 0x28 : Default value 0x11h -> 0xFFh"The GUI succeeded in automatic calibration of LRA(LVC type), but the resonance frequency slightly swings every try.
Customers also tried different LRA (USZ type).Resonant frequency = 228 HzC = 1.2 uFThe parasitic capacitance of the USZ type is smaller than the LVC type, but it is larger than the specification (max 100 pF) of the data sheet.However, automatic calibration succeeded normally for USZ type and it works normally.
Why does auto calibration succeed in USZ type LRA?Please let me know your opinion.
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