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bq77PL900DL Datasheet(PDF) 9 Page - Texas Instruments |
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bq77PL900DL Datasheet(HTML) 9 Page - Texas Instruments |
9 / 60 page bq77PL900 www.ti.com ...................................................................................................................................................... SLUS844B – JUNE 2008 – REVISED JANUARY 2009 Table 2. Host Control Summary MODE TRANSITION FUNCTION AND FIRMWARE PROCEDURE Normal to current protection Vsr > Voc or Vsc for period of toc or tsc Automatically, DSG and CHG turn off, SCD or OCD status changes = 1, XALERT = L Current protection to normal 1. Send commands to transition LTCLR from 0 to 1 to 0 2. Read status bit. XALERT would change to H. 3. Set CHG and DSG FET ON to enable normal operation Vcell > Vov for period of tov Normal to overvoltage protection Automatically, CHG turns off, UV status changes = 1, XALERT = L Overvoltage protection to normal 1. Confirm the OVP protection status is cleared 2. Send command LTCLR from 1 to 0 3. Read status bit. XALERT changes to H. 4. Set CHG FET ON to enable normal operation Vcell < Vuv for period of tuv UVFET_DIS = 0 Automatically, DSG turns off, UV status changes = 1, XALERT = L Normal to undervoltage protection 1. Vcell < Vuv or for period of tuv, UV status changes = 1, XALERT = L UVFET_DIS = 1 2. Send commands to turn off DSG. Undervoltage protection 1. Confirm the OVP protection status is cleared to normal 2. Send command LTCLR from 1 to 0 UVFET_DIS = X 3. Set DSG FET ON to enable normal operation 4. Read status bit. XALERT changes to H. Normal to overtemperature 1. Send commands to turn on TOUT 2. If TIN voltage < 0.975 V, DSG and CHG turn off, OVTEMP status changes = 1, XALERT = L Overtemperature to normal 1. Send commands to turn on TOUT (To return to normal mode, bq77PL900 must acknowledge Vth > 1.075 V) 2. Send commands to transition LTCLR from 1 to 0 3. Set CHG and DSG FET ON 4. Read status bit. XALERT changes to H. Any mode to shutdown 1. Set DSG FET OFF 2. Wait until PACK voltage decreases to 0 V 3. SET shutdown bit to 1 ORDERING INFORMATION TA PACKAGED SSOP48 –40°C to 100°C bq77PL900DL(1) (1) The bq77PL900 can be ordered in tape and reel by adding the suffix R to the orderable part number, I.e., bq77PL900DLR. Copyright © 2008–2009, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): bq77PL900 |
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