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bq2084DBT-V150 Datasheet(PDF) 7 Page - Texas Instruments |
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bq2084DBT-V150 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 69 page  www.ti.com FUNCTIONAL DESCRIPTION OSCILLATOR FUNCTION bq2084-V150 SLUS758 – JUNE 2007 Terminal Functions TERMINAL I/O DESCRIPTION NO. NAME TSSOP DISP 17 I Display control for the LED drivers LED1 through LED5 CLKOUT 35 O 32.768-kHz output to the bq29312A FILT 32 I Analog input connected to the external PLL filter EVENT 25 I Input from bq29312A XALERT output LED1 24 O LED2 23 O LED3 22 O LED display segments that each may drive an external LED LED4 21 O LED5 20 O MRST 26 I Master reset input that forces the device into reset when held high NC 7, 13, 14, 36, 37 – No connection PFIN 18 I Active low input to detect secondary protector output status PRES 5 I Active low input to sense system insertion PU 4 O Output to pull up the PRES pin for detection Register backup that provides backup potential to the bq2084-V150 data registers during RBI 9 I periods of low operating voltage. RBI accepts a storage capacitor or a battery input. SAFE 12 O Active low output for additional level of safety protection; e.g., fuse blow. SCLK 6 O Communication clock to the bq29312A SDATA 10 I/O Data transfer to and from bq29312A SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the SMBC 15 I/O bq2084-V150 SMBus data open-drain bidirectional pin used to transfer address and data to and from SMBD 16 I/O the bq2084-V150 SR1 28 I Connections for a small-value sense resistor to monitor the battery charge- and discharge-current flow SR2 27 I TS 2 I Thermistor voltage input connection to monitor temperature VDDA 31 I Positive supply for analog circuitry VDDD 8 I Positive supply for digital circuitry and I/O pins VIN 1 I Single-cell voltage input from the bq29312A VSSA 3, 29, 30 I Negative supply for analog circuitry VSSD 11, 19, 38 I Negative supply for digital circuitry XCK1/VSSA 34 I 32.768-kHz crystal oscillator input pin or connected to VSSA if the internal oscillator is used 32.768-kHz crystal oscillator output pin or connected to a 100-k Ω, 50 ppm or better XCK2/ROSC 33 O resistor if the internal oscillator is used The oscillator of the bq2084-V150 can be set up for an internal or external operation. As the bq2084-V150 powers up it automatically attempts to start the internal oscillator, but if a 100-k Ω resistor is not connected to ROSC (pin 33), then it attempts to start the oscillator using an external 32.768-kHz crystal. Either the 100-k Ω ROSC resistor OR the 12 pF 32.768-kHz crystal should be mounted, NOT both. The performance of the internal oscillator depends on the tolerance of the 100-k Ω resistor connected between 7 Submit Documentation Feedback |
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