3.3 Ship Mode
To enter the Ship Mode state, connect the equipment as follows:
• Power Supply PS #1: VIN of the BQ25181EVM at 0 V, OFF, or disconnected
• Power Supply PS #2: VBAT of the BQ25181EVM at 3.7 V
• Scope Channel SC #1: VIN at TP5
• Scope Channel SC #2: VBAT at TP8
• Scope Channel SC #3: VSYS at TP6
• Scope Channel SC #4: TS/MR at TP11
Turn ON power supply #2. Enter Ship Mode by setting the EN_RST_SHIP bits in the SHIP_RST register (0x09)
to 2b10. You will know you are in Ship Mode as the voltage on SYS (SC #3) will fall to 0 V and the voltage on
TS/MR (SC #4) will still periodically pulse to monitor button press.
Figure 3-6. SHIP_RST Register: Enabling Ship Mode
Alternatively, Ship Mode can be entered through a long button press. Turn ON power supply #2. With VSYS
active (not in Ship Mode or Shutdown Mode), ensure that the PB_LPRESS_ACTION bits are set to 2b10: Enable
shipmode. After holding the button SW1 for longer than MR_LPRESS (default: 2b01 (10s), the voltage on SYS
(SC #3) will fall to 0 V.
Testing Procedures
SLUUCL3 – APRIL 2022
BQ25181 EVM User's Guide
9
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