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BQ2002CSN Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2002CSN Datasheet(HTML) 4 Page - Texas Instruments |
4 / 12 page Starting A Charge Cycle Either of two events starts a charge cycle (see Figure 4): 1. Application of power to VCC or 2. Voltage at the BAT pin falling through the maximum cell voltage VMCV where VMCV = 2V ±5%. If the battery is within the configured temperature and voltage limits, the IC begins fast charge. The valid battery voltage range is VLBAT <VBAT <VMCV, where VLBAT = 0.175 ∗ VCC ±20% The valid temperature range is VTS >VHTF where VHTF = 0.6 ∗ VCC ±5%. If VBAT ≤ VLBAT or VTS ≤ VHTF, the IC enters the charge- pending state. In this state pulse trickle charge is applied to the battery and the LED flashes until the voltage and temperature come into the allowed fast charge range or VBAT rises above VMCV. Anytime VBAT ≥ VMCV, the IC enters the Charge Complete/Battery Absent state. In this state the LED is off and trickle charge is applied to the battery until the next new charge cycle begins. Fast charge continues until termination by one or more of the five possible termination conditions: n Peak voltage detection (PVD) n Negative delta voltage (- ∆V) n Maximum voltage n Maximum temperature n Maximum time 4 Corresponding Fast-Charge Rate TM Termination Typical Fast- Charge Time Limits (minutes) Typical PVD and - ∆V Hold-Off Time (seconds) Pulse- Trickle Rate Pulse- Trickle Pulse Width (ms) Maximum Synchronized Sampling Period (seconds) C/2 Mid PVD 160 300 C/32 73 18.7 1C Low PVD 80 150 C/32 37 18.7 2C High - ∆V 40 75 C/32 18 9.4 Notes: Typical conditions = 25°C, VCC = 5.0V Mid = 0.5 * VCC ±0.5V Tolerance on all timing is ±12%. Table 1. Fast-Charge Safety Time/Hold-Off Table bq2002C TD2002C1.eps Fast Charging VCC = 0 Fast Charging CC Output LED Charge initiated by application of power Charge initiated by battery replacement Pulse-Trickle See Table 1 1s Figure 4. Charge Cycle Phases |
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