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MSP430BQ1010IRTVT Datasheet(PDF) 13 Page - Texas Instruments

Part No. MSP430BQ1010IRTVT
Description  WIRELESS RECEIVER-SIDE COMMUNICATION AND POWER MONITORING IC
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

MSP430BQ1010IRTVT Datasheet(HTML) 13 Page - Texas Instruments

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MSP430BQ1010
www.ti.com
SLAS696 – DECEMBER 2010
Adapter Detect
This block detects if there is an external adapter present in the system and turns off the wireless power. The
external adapter voltage should be connected to the ADAPTER_DETECT pin through a 6:1 resistor divider.
When voltage at ADAPTER DETECT pin exceeds VADAPTER-DETECT-THRESHOLD, an external adapter in the system
is detected and an end power packet (message 0x01) is sent to the transmitter. This causes the transmitter to
turn off the wireless power. The adapter detect feature is enabled initially in the power-up routine where the
BQ25046_OUT_ENABLE pin is set if no external adapter is detected. This feature is always enabled in the main
loop routine.
Minimum Load Detect
This block detects if the BQ25046 current (measured at ISET_SCALE) drops below a certain threshold and turns
on the additional load in the system, required to maintain stability in the system, by setting the MIN_LOAD pin
high. Hysteresis is implemented by setting MIN_LOAD high when voltage at ISET_SCALE drops below VISET-
SCALE-MIN-LOAD-LO-THRESHOLD and setting MIN_LOAD low only when voltage at ISET_SCALE rises above VISET-
SCALE-MIN-LOAD-HI-THRESHOLD. The Min Load Detect feature is enabled after the power-up routine.
Termination Detect
This block is enabled in the main loop routine only if the TERMINATION_ENABLE pin is externally pulled high (to
DVCC). The termination condition is detected if the BQ25046 output current, measured at ISET_SCALE pin,
drops below either VISET_SCALE_TERM_HI_THRESHOLD or VISET_SCALE_TERM_LO_THRESHOLD threshold. On detecting a valid
termination condition, an end power transfer packet (message 0x01) is sent to the transmitter either after 3
minutes or 5 seconds, depending on if the voltage at ISET_SCALE dropped below VISET_SCALE_TERM_HI_THRESHOLD
or VISET_SCALE_TERM_LO_THRESHOLD threshold, respectively.
Overcurrent Detect
This block detects an overcurrent condition when the analog voltage at ISET_SENSE (with a 470-
Ω resistor
connected between this pin and ground), which represents the BQ25046 output current, exceeds the
VOVER_CURRENT_THRESHOLD. If a lower BQ25046 current limit is desired, a second resistor can be connected from
this pin to the ISET pin on the BQ25046. The transimpedance gain at this pin is 1.31 V/A. On detecting an
overcurrent condition, an end power transfer packet (message 0x05) is sent to the transmitter, and the
transmitter turns off the wireless power. This feature is always enabled in the main loop routine.
Wireless Disable
This block is always enabled in the main loop routine. On externally pulling the WIRELESS_DISABLE input pin
high (to DVCC), an end power transfer packet (message 0x03) is sent to the transmitter, and the transmitter
turns off the wireless power.
Copyright © 2010, Texas Instruments Incorporated
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