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BQ2014 Datasheet(PDF) 15 Page - Texas Instruments |
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BQ2014 Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 22 page  Reset Register (RST) The reset register (address=39h) provides the means to perform a software-controlled reset of the device. By writing the RST register contents from 00h to 80h, a bq2014 reset is performed. Setting any bit other than the most-significant bit of the RST register is not al- lowed, and results in improper operation of the bq2014. Resetting the bq2014 sets the following: n LMD = PFC n CPI, VDQ, NAC, and NACL = 0 n CI and BRP = 1 Note: Self-discharge is disabled when PROG5 =H. Display The bq2014 can directly display capacity information us- ing low-power LEDs. If LEDs are used, the program pins should be resistively tied to VCC or VSS for a pro- gram high or program low, respectively.. The bq2014 displays the battery charge state in relative mode. In relative mode, the battery charge is repre- sented as a percentage of the LMD. Each LED segment represents 20% of the LMD. The capacity display is also adjusted for the present bat- tery temperature. The temperature adjustment reflects the available capacity at a given temperature but does not affect the NAC register. The temperature adjust- ments are detailed in the TMPGG register description. When DISP is tied to VCC, the SEG1–5 outputs are inac- tive. Note: DISP must be tied to VCC if the LEDs are not used. When DISP is left floating, the display becomes active whenever the NAC registers are count- ing at a rate equivalent to VSRO < -4mV or charge cur- rent is detected, VSRO >VSRQ. When pulled low, the seg- ment outputs become active immediately. A capacitor tied to DISP allows the display to remain active for a short period of time after activation by a push-button switch. The segment outputs are modulated as two banks of three, with segments 1, 3, and 5 alternating with seg- ments 2 and 4. The segment outputs are modulated at approximately 100Hz, with each segment bank active for 30% of the period. SEG1 blinks at a 4Hz rate whenever VSB has been de- tected to be below VEDV1 (EDV1 = 1), indicating a low- battery condition. VSB below VEDVF (EDVF = 1) disables the display output. Microregulator The bq2014 can operate directly from 3 or 4 cells. To facili- tate the power supply requirements of the bq2014, an REF output is provided to regulate an external low-threshold n- FET. A micropower source for the bq2014 can be inexpen- sively built using the FET and an external resistor; see Figure 1. 15 bq2014 |
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