M62244FP Li-ion Battery Charge Controller IC REJ03F0067-0100Z Rev.1.0 Sep.19.2003 Description M62244FP is a semiconductor integrated circuit designed as Li-ion battery charge control IC. Built-in constant current and constant voltage circuit allows for charging Li-ion battery. Features • • • • • • • • • • • • Available for 4.2V battery Built-in high precision ref. voltage (charge voltage) 4.2V ± 30mV Available for constant current and constant voltage charge Built-in protection function for charge prohibition of over-discharged battery Built-in protection function for charge prohibition of high and low temperature battery Built-in trickle charge function Charge condition displayed by 2 system LEDs Built-in delay circuit for chattering prevention Built-in charge OFF function when adaptor is pulled out Built-in charge OFF function when adaptor voltage goes down Charge ON/OFF available by external control Built-in 3 kind of timer (externally variable) Initial setting timer : about 5 min. Recharge timer : about a hour Charge timer : about 4 hour • Built-in LED blinking function when abnormal Application Li-ion battery charger Pin Configuration Vadp1 3 Vadp2 4 Tdet 5 Vrchg 6 Ifull 7 Cosc 8 STP 9 VREF 10 20 M62244FP Idet2 1 Vsense 2 TSSOP20 Rev.1.0, Sep.19.2003, page 1 of 17 19 18 17 16 15 14 Idet1 CTRL VCC LED2 LED1 GND2 C2 12 C1 GND 11 Vcvref 13 M62244FP Description of pins No. Pin name I/O Function Protection diode Positive Negative 18 Vcc Power-supply input gnd1 16 17 LED1 LED2 O I/O Vcc Vcc gnd2 gnd2 15 9 GND2 STP I LED drive LED drive (with function for switching the LEDs’ blinking period) The blinking period of LED1 is set to 0.6 Hz (typ.) by fixing this signal low. Ground for power supply Forcible charge OFF H (or open): Charging possible, L: Charging stopped Vcc gnd1 8 COSC Vcc gnd1 12 5 10 GND1 Tdet Vref I O For connection to the capacitor used to set the oscillator circuit’s frequency Ground Battery-temperature detection Reference power-supply output 6 Vrchg I 20 1 Idet1 Idet2 I I 2 Vsense I/O 7 Ifull I 13 C1 14 C2 19 CTRL O 3 Vadp1 I 4 Vadp2 I 11 Vcvref O Vcc Vcc gnd1 gnd1 Adjustment of start-recharging voltage The pin voltage is set to 1.0 V (typ.). The voltage at which recharging starts (threshold) may be changed by using an external resistor etc. to adjust the voltage on this pin. The actual voltage is the voltage on this pin multiplied by 11.8 dB. Charging-current detection The drop in voltage across an external resistor RS (connected between these pins) reflects the size of the charging current and is used to detect the completion of charging. Battery-voltage detection Detects the battery-voltage value for use in charging control. Charging-completed current switching Select the current taken as indicating the completion of charging by leaving this pin open or connecting it to ground. The charging-completed current is controlled by comparing the voltage on the Ifull pin with the level 12 dB above the voltage drop between Idet1 and Idet2. Vcc gnd1 gnd1 gnd1 Vcc gnd1 Compensation for the charge-control phase A capacitor between C1 and ground improves the stability of oscillation during charging at constant current and constant voltage. For connection of a capacitor that comes into play during switching of the charging current Reduces overshooting of the charging current when the charging current is switched. Output for charge control Controls the base (gate of a p-ch transistor) of an external pnp transistor so that constant-current or constant-voltage charging is applied. For adjusting the adapter-detection voltage 1 (detection voltage when charging has stopped) Pin-voltage is set to 1.0 V (typ.). The value to be taken as adapterdetection voltage 1 is controlled by using an external resistor etc. to adjust the voltage on this pin. The actual voltage is the voltage on this pin multiplied by 14.3. Vcc gnd1 Vcc gnd1 gnd2 Vcc gnd1 For adjusting the adapter-detection voltage 2 (detection voltage during charging) Pin-voltage is set to 1.0 V (typ.). The value to be taken as adapterdetection voltage 2 is controlled by using an external resistor etc. to adjust the voltage on this pin. The actual voltage is the voltage on this pin multiplied by 13.9dB. Reference voltage for constant-voltage control Vcc gnd1 Vcc gnd1 Rev.1.0, Sep.19.2003, page 2 of 17 M62244FP Pin Description No. Pin name Equivalent circuit No. Pin name Equivalent circuit VCC VCC No. Pin name Equivalent circuit VCC VBG vbg 20kΩ 6 16 LED1 Vrchg 100kΩ 14 C2 VCC VCC 10kΩ 20 17 LED2 Idet1 19 CTRL 40kΩ VCC Idet1 VCC 100kΩ VBG 9 20kΩ 1 STP Idet2 3 Vadp1 100kΩ VCC Vcc VCC COSC 17kΩ 8 2 VBG 20kΩ Vsense 4 Vadp2 100kΩ VCC VCC 100kΩ VCC 5 7 Tdet Ifull VCC 10 Vref Rev.1.0, Sep.19.2003, page 3 of 17 11 Vcvref VCC 13 C1 M62244FP Absolute maximum ratings (Ta=25°C, unless otherwise noted) Symbol Rating Unit Max. applied voltage Vmax 7.0 V CTRL pin: drive current LED drive current Vcvref pin: output current Allowable dissipation Ictrl Iled Icvref Pd mA mA mA mW Thermal derating Kθ 30 20 −5 800 −8 Operating temperature range Storage temperature range Topr Tstg −20 to +85 −40 to +125 °C °C Internal power dissipation : Pd (mW) Item mW/°C Remarks When mounted on a single-layered board (70 mm × 70 mm × 1.6 mm) (natural convection condition) 1000 800 600 400 200 0 0 25 50 85 100 Ambient temperature: Ta (°C) Figure 1 Thermal derating curve Rev.1.0, Sep.19.2003, page 4 of 17 125 150 M62244FP Electrical Characteristics Unless otherwise specified, Ta = 25°C, VCC = 5.5 V, resistor for current detection = 0.2 Ω, and pins for adjustment Vstrt, Vstp, Ifull, and Vrchg are open-circuit.) Block All Item Unit Min. Typ. Max. Remarks VCC 3.0 5.5 6.5 V Circuit current Icc 5.0 mA When not connected to a battery Battery-discharge current (when not charging) Ibatout 1.50 µA Battery is discharged to the IC when VBAT = 4.2 V (through pins Idet1, Idet2, Vsense) Reference voltage Vref 1.176 1.200 1.224 V IL=-1mA Vcvref1 2.076 2.100 2.124 V IL=-5mA Vcvref2 2.07 2.10 2.13 V Excessive-discharge detection voltage Vlv 1.9 2.0 2.1 V Hysteresis in excessdischarge detection voltage Vlvhis 25 50 75 mV Fast-charge start voltage Vfchg 2.8 2.9 3.0 V Hysteresis in fast-charge start voltage Vfchghis 250 300 350 mV Recharge-start voltage Vrchg 3.85 3.90 3.95 V When no external resistor is connected to Vrchg. Selectable by an external resistor Charging-completed voltage Vfull Vrchg +0.03 Vrchg +0.05 Vrchg +0.07 V Hysteresis in the recharge-start voltage Charge control voltage Ta = 15 to 35°C Vchg11 4.190 4.200 4.210 V When Ichg = 130 mA (RS = 0.2 Ω). See note 1. Ta = 20 to 85°C Vchg12 4.170 4.200 4.230 V Ta = 15 to 35°C Vchg21 4.187 4.200 4.213 V Ta = 20 to 85°C Vchg22 4.167 4.200 4.233 V Ta = 0 to 50°C Vchg31 4.170 4.200 4.230 V Ta = 20 to 85°C Vchg32 4.150 4.200 4.250 V Vov 4.30 4.35 4.40 V Excessive voltage detection Charging current detector Rated value Power-supply voltage range for charge-control Reference voltage for constantvoltage control Batteryvoltage detector Symbol Precharge 2 start voltage Fast charge start voltage When Ichg = 130 mA (RS = 0.2 Ω). See note 2. Whe Ichg = 130 mA (RS = 0.2 Ω), no external resistor Precharge current 1 Ipre1 2 3 5 mA Precharge current 2 Ipre2 10 20 30 mV Voltage across Rs when VBAT = 2.6 V Fast-charge current Ichg 190 200 210 mV Voltage across Rs when VBAT = 3.6 V Charging-completed current Ifullchg1 19 25 31 mV Voltage across Rs when Ifull is open-circuit. Ifullchg2 9 15 21 mV Voltage across Rs when Ifull is connected to ground. Ioc 250 300 350 mV Excessive current detection Rev.1.0, Sep.19.2003, page 5 of 17 M62244FP Block Item Symbol Rated value Min. Typ. Max. Temperature detector Battery temperature detection, cold end (-3°C) Tth2 75.49 (-2.0°C) 76.67 (-3.5°C) Hysteresis at the cold end (at -5°C or equivalent) Tthhis2 10 Battery temperature detection, hot-end 1 (43°C) Tth3 Battery temperature detection, hot-end 2 (55°C) Battery connection detector Unit Remarks 77.94 (-5.0°C) % Note 3 20 30 mV 33.11 (44.5°C) 34.23 (43°C) 35.43 (41.5°C) % See note 3 Tth4 25.05 (56.5°C) 25.94 (55°C) 26.89 (53.5°C) % See note 3 Battery connectiondetected voltage, low extreme Vbc1 0.8 1.0 1.2 V Battery connectiondetected voltage, high extreme Vbc2 3.9 4.0 4.1 V Battery connectiondetected current Ibc1 14 20 26 mV Voltage across Rs when Ifull is open-circuit. Ibc2 3 9 15 mV Voltage across Rs when Ifull is connected to ground. Flowcharts Start LED1 and LED2 off No battery Is a battery connected? Battery present Vcc<5.2V A Detection of adapter voltage (1/3a) 6.3V<Vcc B 5.2V<Vcc<6.3V Detection of battery temperature -3°C<Tdet<43°C LED1 and LED2 off D Rev.1.0, Sep.19.2003, page 6 of 17 C Tdet<-3°C 43°C<Tdet M62244FP Item for detection Time detection takes Conditions for detection Battery connection 10 ms × 1 time = 10 ms Constantly detected every 400 ms (when more than a specified amount of charge-current is flowing, this detection is omitted). Battery temperature 1.0-V 4 consecutive 50-ms periods = 200 ms 3 consecutive 25-ms periods = 75 ms 2.0-V 3 consecutive 200-ms periods = 600 ms 2.9-V 3 consecutive 200-ms periods = 600 ms 3.9Excessive voltage Charge completion 4 consecutive 1.6-s periods = 6.4 s 3 consecutive 400-ms periods = 1.2 s 3 consecutive 3.2-s periods = 9.6 s Excessive charge current Adapter voltage 1 3 consecutive 400-ms periods = 1.2 s Presence of a battery Presence of a battery and detection of normal temperature Presence of a battery and detection of normal temperature Presence of a battery and detection of normal temperature Completion of charging for a connected battery Presence of a battery Presence of a battery and detection of normal temperature Charging is in progress Adapter voltage 2 Adapter voltage 3a/3b 4 consecutive 50-ms periods = 200 ms 4 consecutive 50-ms periods = 200 ms 4 consecutive 200-ms periods = 0.8 s Constant detection (whenever charging has stopped) Constant detection (during charging) Constant detection Notes: 1. The timer for precharge 1 and 2 and the charge timer continue to count in the adapter-voltage standby modes and battery-temperature standby modes. Counting by these timers restarts from the previous value when charging resumes. 2. Detection of adapter-voltage abnormality (5.2/4.95/6.3 V) and battery connection is constant. Rev.1.0, Sep.19.2003, page 7 of 17 M62244FP A Adapter-voltage standby low-end (L) mode B Adapter-voltage standby low-end (L) mode Charging stops until the adapter voltage returns to the allowed range. Adapter-voltage standby high-end (H) mode Charging stops until adapter voltage returns. Stop charging Stop charging Leave LED1 and LED2 in their pre-transition states LED1 on, LED 2 off NG Detection of excessive voltage OK Vcc<5.2V Detection of adapter-voltage 1 or 3a H OK 6.3V<Vcc Detection of adapter-voltage 3b 6.1V<Vcc B Vcc<6.1V 5.2V<Vcc<6.3V Return to the pre-transition state C NG Detection of excessive voltage H Return to the pre-transition state Battery-temperature standby mode H Charging stops until battery temperature returns. Abnormal-condition mode Charging stops until removal/connection of battery or adapter (reset detection). Stop charging Stop charging LED1 and LED2 off LED1 on, LED2 off (LED1 blink period: 2.5 Hz) Stop charge-timer (hold) Detection of excessive voltage Tdet<-3°C 43°C<Tdet Detection of battery connection Battery present NG OK Detection of battery temperature -3°C<Tdet<43°C H 2.6V<Vcc Detection of reset Vcc<2.6V LED1 and LED2 off, initialize timer Return to the state before the transition (resume timer operation) Start Rev.1.0, Sep.19.2003, page 8 of 17 No battery M62244FP D F Precharge 1 Fast charge Start constant-current charging at 3 mA. Reset and start 60-min. timer Vcc<4.95V Vcc<4.95V B A 6.3V<Vcc Detection of adapter voltage 2/3a 4.95V<Vcc<6.3V 4.95V<Vcc<6.3V Passage of 240 min. H G NG OK OK Detection of battery voltage Detection of charge-current 1 s elapses NG Detection of excessive current and excessive voltage OK H YES NO Passage of 240 min. Ichg<125mA G YES 3.95V<Vsense Vcc<4.95V A 2.6V<Vsense< 6.3V<Vcc Detection of adapter voltage 2/3a Vsense<3.95V 100mA<Ich 1.0V<Vsense Detection of battery voltage Vsense<2.6V B Detection of battery voltage H Start constant-voltage charging at 4.2 V (240-min. timer continues counting) 4.95V<Vcc<6.3V H 4.2V<Vsense 3.95V<Vsense YES Passage of 60 min. H NO NO Detection of excessive voltage NG Detection of excessive voltage YES NO Vsense<1.0V Start after a delay of 1 s B YES Passage of 10 min. Charging-completed judgement mode Stop charging (240-min. timer in (F) continues to count) Reset and start 240-min. timer 6.3V<Vcc Detection of adapter voltage 2/3a A G Start constant-current charging at 1.0 A Vsense<2.6V Detection of battery voltage NO 2.6V<Vsense<3.95V Detection of excessive voltage NG Vcc<4.95V A 6.3V<Vcc Detection of adapter voltage 2/3a OK F B 4.95V<Vcc<6.3V Vsense<2.0V Detection of battery voltage LED1 off, LED2 on YES Passage of 240 min. G Charging completed (Stop the timer) NO 2.0V<Vsense Mask 60-min. timer Detection of excessive current and excessive voltage NG H Vcc<5.2V A OK E Detection of adapter voltage 2/3a Vsense<2.6V 2.6V<Vsense< 6.3V<Vcc B 5.2V<Vcc<6.3V Detection of battery voltage Detection of excessive voltage NG 4.2V<Vsense E Precharge 2 125mA<Ichg Start constant-current charging at 100 mA. OK Detection of charge-current Ichg<125mA 3.9V<Vsense Detection of battery voltage Vsense<3.9V G Reset and start 60-min. timer. LED1 on, LED2 off Vcc<4.95V A 6.3V<Vcc Detection of adapter voltage 2/3a B Reset the timer 4.95V<Vcc<6.3V YES Passage of 60 min. F H NO NG Detection of excessive current and excessive voltage OK 1.95V<Vsense<2.9V Vsense<1.95V Detection of battery voltage 2.9V<Vsense Mask 60-min. timer F Rev.1.0, Sep.19.2003, page 9 of 17 H M62244FP Battery voltage Timing chart 4.2V 3.9V 2.9V 2.0V Fast charging Start recharging Charge current Charging at Charging at constant current constant voltage 1.0A Battery connected Precharge 2 125mA 100mA Current on completion of charging Recharging completed Charging completed 3mA Precharge 1 LED1 On On Off Off Off On LED2 Off Off 2.9V detection 3.95V/3.9V detection 3.95V detection Charging-completed detection Precharge 1 Operation of the 60-min. timer Precharge 2 Operation of the 60-min. timer Fast charge Operation of the 240-min. timer Rev.1.0, Sep.19.2003, page 10 of 17 3.9V detection M62244FP Description of operation The detection times given in this section are for Tchg = 240 minutes. The voltage values are all typical values. The charge-current values are for RS = 0.2 Ω. 1. Detecting the adapter-voltage When an adapter is connected, the voltage from the adapter is the Vcc-pin voltage for the power supply of the IC. Detection of the adapter voltage thus takes the form of monitoring of the Vcc-pin voltage; when this voltage departs from the specified range, charging stops, and the standby state (adapter-voltage standby mode) is entered. Detection is used to set up the following conditions. When the adapter voltage falls: (1) When charging has stopped (adapter-detection voltage 1) (a) If Vcc > 5.2 V, the IC enters the charging-enabled state. (b) When Vcc ≤ 5.2 V, the IC enters the corresponding charge-standby state (adapter-voltage standby, L mode). (2) During charging (adapter-detection voltage 2) (a) As long as Vcc > 4.95 V, charging is continued. (b) When Vcc ≤ 4.95 V, the IC enters the corresponding charge-standby state (adapter-voltage standby, L mode). When the adapter voltage rises: (1) When Vcc ≥ 6.3 V, the IC enters the corresponding charge-standby state (adapter-voltage standby, H mode). (2) When Vcc ≤ 6.1 V, the IC returns to the normal state. Charging stops in adapter-voltage standby L mode, and the LEDs retain the states they had before the mode transition. Charging stops in adapter-voltage standby H mode, but in this case LED1 blinks, and LED2 is turned off. On normal resumption from either of the above modes, the system returns to the state before the mode transition. Triggering of resets: (1) When Vcc ≤ 2.6 V, operation of the IC is terminated (outside the operating range). (2) When Vcc ≥ 2.8 V, the IC starts operation from the reset state. 2. Detecting a connected battery The IC uses the conditions below to test for battery connection. The conditions are designed for use with batteries in battery packs that do not include thermistor pins. (1) Either of the following conditions is assumed to indicate that a battery is connected. (a) Detection of a battery voltage of 1.0 V or more (b) During application of precharge 1 for 400 ms, the battery-voltage never rises above 4 V. (2) Either of the following conditions is assumed to indicate the absence of a battery. (a) During charging Charging current remains at or below 100 mA (when the Ifull pin is open), and the battery voltage remains at or below 1.0 V when the charge-switch is turned off every 400 ms. (b) When charging has stopped Battery-voltage is 1.0 V or less, and the battery voltage becomes 4 V or more after the 10-ms charge-switch is turned on. Rev.1.0, Sep.19.2003, page 11 of 17 M62244FP 3. Detecting battery temperature The voltage produced by division by the externally connected pull-up resistor (for Vcvref) and external thermistor is input to the Tdet pin. This voltage indicates the battery’s temperature. How the temperature limits affect operation is described below. (1) When charging is to start Charging starts as long as the temperature is within the range from –3.5°C to 43°C. (2) While charging Charging stops and the IC enters the corresponding standby mode (battery-temperature standby mode) if the temperature departs from the –5°C to 55°C range. 4. Precharge 1 (3-mA constant-current charge) Precharge 1 starts when a connected battery is detected and one of the conditions below are satisfied. The 3-mA current value for precharge 1 is an internal setting. (1) Vcc ≥ 5.2 V (2) Battery temperature is greater than or equal to –3°C and less than 43°C Transitions from pre-charge 1 to other modes occur under the following conditions. (1) When the battery voltage is 2.0 V or more, the 60-min. timer is masked and the IC makes the transition to precharge 2. (2) The IC enters the abnormal mode when the battery voltage is 1.0 V or less 10 minutes after the start of a period in precharge 1. (3) The IC enters the abnormal mode when the battery-voltage is 2.0 V or less 60 minutes after the start of a period in precharge 2. 5. Precharge 2 (100-mA constant-current charge) When the battery-voltage is 2.0 V or more but less than 2.9 V during precharge-1 operation, the IC enters precharge 2. The current value of precharge 2 is controlled so that the voltage between pins Idet1 and Idet2 is 20 mV, which is an internal setting. When RS = 0.2 Ω, constant-current control obtains 20 mV/0.2 Ω = 100 mA. Transitions from precharge 2 to other modes occur under one of the following conditions. (1) When the battery voltage is 2.9 V or more, the 60-min. timer is masked and the IC makes the transition to fastcharge mode. (2) The IC enters the abnormal mode when the battery-voltage is 2.9 V or less 60 minutes after the start of a period in precharge2. (3) The IC enters the abnormal mode when the battery voltage is below 1.95 V. 6. Fast charge (1.0-A constant-current charge/4.2-V constant voltage charge) When the IC is in either precharge mode and the battery-voltage is 2.9 V or more, the IC starts fast charging, during which the battery is charged at constant current and then constant voltage. Constant-current control is applied while the battery-voltage is 2.9 V or more but less than 4.2 V. During constantcurrent charging, the voltage between pins Idet1 and Idet2 is 200 mV. This is an internal setting. Accordingly, when RS = 0.2 Ω, the constant-current value is 200 mV/0.2 Ω = 1.0 A. Constant-voltage control is applied while the battery voltage is 4.2 V. In charging at constant voltage, the charge current is controlled to keep the battery voltage at 4.2 V. The following conditions govern transitions from fast charging to other modes. (1) When the charging current is less than the charging-completed current, the IC makes the transition to the charging-completed judgement mode. An internally set voltage of 25 mV is the default measure for chargingcompleted current, so when RS = 0.2 Ω, the current threshold is 25 mV/0.2 Ω = 125 mA. When the Ifull pin is open-circuit, the above default value is selected; ground connection of Ifull selects a value of 15 mV. (2) When the charge-current does not fall below the charging-completed current within 240 minutes of the start of fast charging, the IC makes the transition to the charging-completed judgement mode. Note, however, that the judgement being made in the completion-judgement mode differs from that for the transition of item (1). (3) The IC enters the abnormal mode when the battery voltage is 2.6 V or less. Rev.1.0, Sep.19.2003, page 12 of 17 M62244FP 7. Charging-completed judgement (1) When fast charging is in progress and the charging current falls below the charging-completed current, charging stops. One second later, the battery voltage is detected, and the IC performs one of the following operations according to the detected value. (a) If the voltage is 3.95 V or more, LED1 is turned off and LED2 is turned on. This indicates the completion of charging. (b) If the battery-voltage is 2.6 V or more but below 3.95 V, the IC makes the transition to fast charging. (c) If the battery-voltage is below 2.6 V, the IC enters the abnormal mode. (2) When the charging current is not below the charging-completed current 240 minutes after the start of fast charging, charging stops. One second later, the battery voltage is detected, and the IC performs one of the following operations according to the detected voltage value. (a) If the battery-voltage is 3.95 V or more, LED1 is turned off and LED2 is turned. This indicates the completion of charging. (b) If the battery-voltage is below 3.95 V, the IC enters the abnormal mode. 8. Recharging On completion of charging, the IC continues to detect the battery voltage. When the voltage is 3.9 V or less, the timer is initialized and recharging in the form of fast charging starts up. 9. Detecting abnormality When a condition in the list below is detected, the IC judges that the current state is abnormal and stops charging (abnormal mode). Other than as described in item (8) below, the battery or adapter is disconnected and then connected to make operation resume from the abnormal mode . (1) The battery voltage is 1.0 V or less after 10 minutes in precharge 1. (2) The battery voltage is 2.0 V or less after 60 minutes in precharge 1. (3) Charging in the precharge-2 mode has continued for 60 minutes. (4) The battery voltage is 2.6 V or less during fast charging. (5) The battery voltage is 2.6 V or less at charging-completed judgement. (6) The battery voltage is 4.35 V or more and excessive voltage is detected. (7) The charging current is 1.5 A or more and excessive current is detected. (8) The adapter voltage (voltage on the Vcc pin) is 6.3 V or more and excessive adapter-voltage is detected. Note, however, that when 6.1 V or less is detected, the IC returns to a normal state (adapter-voltage standby H mode). (9) The battery-voltage is below 1.95 V in the precharge-2 mode. (10) The battery-voltage is below 3.95 V 240 minutes after the start of fast charging. 10. LED display State LED1 (red) LED2 (green) Battery disconnected Charging in progress Charging completed Off On Off Off Off On Temperature-standby mode Adapter-voltage standby L mode Adapter-voltage standby H mode Abnormal mode Off Retains the previous state Blinking Blinking Off Retains the previous state Off Off When LED2 (green) is not in use, fixing the LED2 pin to low level selects a blinking period of 0.625 Hz (typ.) for LED1 (red). Note: When LED2 (green) is not in use, the LED2 pin must either be pulled up by a resistor or connected to ground. Rev.1.0, Sep.19.2003, page 13 of 17 M62244FP 11. Setting the voltages The recharge-start voltage, adapter-detection voltage 1, and adapter-detection voltage 2 can be adjusted to desired thresholds through the connection of external resistors that adjust the voltages on the Vrchg, Vadp1, and Vadp2 pins, respectively. When a pin is open, the corresponding voltage is the IC’s internal setting as specified in the electrical characteristics. When the Vadp1 pin, Vadp2 pin, and Vrchg pin are open-circuit, the output voltage is the VBG voltage (constant voltage source used inside the IC) divided by 20 kΩ and 100 kΩ, as shown in section 2, Pin-Internal Equivalent Circuits. The settings are given below. <Method of setting> Let the detection voltages when the recharge-start voltage, adapter-detection voltage 1, and adapter-detection voltage 2 pins are open-circuit be Vrchg_o (V), Vadp1_o (V), and Vadp2_o (V), respectively, and the required detection-voltage values be Vrchg_c (V), Vadp1_c (V), and Vadp2_c (V), respectively. The voltage to be applied to each of the adjustment pins is then obtained by the equations under (1), (2), and (3) below. (1) Recharge-start voltage Voltage setting on the Vrchg pin (V) = Voltage on the Vrchg pin (open-circuit) Vrchg_o ×Vrchg_c Voltage on the Vadp1 pin (open-circuit) Vadp1_o × Vadp1_c Voltage on the Vadp2 pin (open-circuit) Vadp2_o × Vadp2_c (2) Adapter-detection voltage 1 Voltage setting on the Vadp1 pin (V) = (3) Adapter-detection voltage 2 Voltage setting on the Vadp2 pin (V) = Desired detection values are obtained by using external resistors to apply the voltages obtained by the above equations to the corresponding pins. Either connect a resistor between the adjustment pin and ground, or connect one resistor between the Vcvref pin and adjustment pin and another between the adjustment pin and ground. Note, however, when using the Vcvref pin, that –5 mA is specified as the maximum load-current for this pin. Take care in selecting the resistor values. Note: In the descriptions of pins Vrchg, Vadp1, and Vadp2 pins in section 1, Description of pins, decibel units are used to describe how the voltages on these pins set the detection voltages. The values used in the above equations are calculated after changing the values as shown below. The calculation is on the assumption that each pin carries the rated voltage of 1.0 V when in its open-circuit state. (4) Recharge-start voltage Vrchg_c Voltage on the Vrchg pin Rev.1.0, Sep.19.2003, page 14 of 17 = Vrchg_o Voltage on the Vrchg pin (open-circuit) 3.95 → 11.8dB M62244FP (5) Adapter-detection voltage 1 Vrchg_c Voltage on the Vadp1 pin = Vrchg_o Voltage on the Vadp1 pin (open-circuit) 5.20 → 14.3dB = Vrchg_o Voltage on the Vadp2 pin (open-circuit) 4.95 → 13.9dB (6) Adapter-detection voltage 2 Vrchg_c Voltage on the Vadp2 pin 12. Forcible termination of charging Charge is forcibly stopped by setting the STOP signal to low level. At this time, the LEDs are turned off and all timers are initialized. 13. Frequency of oscillation IC side External side Vc vref R [Ω] CO SC The rated oscillation frequency of this IC is 1.28 kHz, the value when R = 100 kΩ and C = 0.01 µF in the figure. Change the values of R and C to change the frequency. C [ F] Note: Changing the frequency of oscillation changes the timing of the IC's charge timers. (1) External C, R, and oscillation frequency µF] C [µ 0.0022 R [Ω] 0.047 0.01 0.022 0.047 0.1 82k 5.695 2.666 1.253 0.570 0.267 0.125 91k 5.878 2.751 1.298 0.588 0.275 0.129 100k 5.818 2.723 1.280 0.582 0.272 0.128 110k 5.647 2.643 1.242 0.565 0.264 0.124 120k 5.435 2.544 1.196 0.543 0.254 0.120 130k 5.210 2.439 1.146 0.521 0.244 0.115 Note: Frequency is in kHz. Variation of C and R values is not taken into account. (2) Relation between the frequency of oscillation and timing, for each timer Item Value (frequency of oscillation = Fosc (Hz)) Charge timer (min.) Precharge timer 1 (min.) Precharge timer 2 (min.) Frequency of LED1 blinking (LED2 = high) (Hz) Frequency of LED1 blinking (LED2 = ground) (Hz) 1.28k/Fosc × 240 1.28k/Fosc × 10 1.28k/Fosc × 60 Fosc/1.28k × 2.5 Fosc/1.28k × 0.625 Rev.1.0, Sep.19.2003, page 15 of 17 M62244FP Sample application circuit 19 CTRL 0.01µF Logic power-supply Reference voltage source 11 Vref 10 Reference voltage/logic power-supply module Oscillator Cosc 8 Constant-voltage control C1 13 GND2 C2 14 Constant-current control 1µF 0.01µF Charge-control module Battery-connected detection 3 Charging-current detection Idet1 20 Charging current Vcc Charging-completed current detection 18 Idet2 1 Vcvref Excessive current detection Vadp1 3 Adapter detection 1 4 Adapter detection 2 Vadp2 Rs Open or GND Ifull 7 Charging-current detection module Vcvref Vsense 2 Adapter detection 3 Reset detection Battery-voltage buffer Excessive discharge detection Start-fast-charging voltage detection Adapter-voltage detection module Excessive voltage detection Battery-connected detection 1 STP Open or GND 9 Reset circuit Control-logic block Battery-connected detection 2 Vcvref Vrchg Charging-completed/ recharge detection 6 Battery-voltage detection module LED1 LED2 Vcvref Vcvref 16 Tdet 17 –3°C 5 GND2 15 43°C/ 55°C GND1 12 LED control module M62244FP Rev.1.0, Sep.19.2003, page 16 of 17 Temperature detection module M62244FP Package Dimensions 20T2X Note : Please contact Renesas Technology Corporation for further details. Rev.1.0, Sep.19.2003, page 17 of 17 Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or (iii) prevention against any malfunction or mishap. Notes regarding these materials 1. These materials are intended as a reference to assist our customers in the selection of the Renesas Technology Corp. product best suited to the customer's application; they do not convey any license under any intellectual property rights, or any other rights, belonging to Renesas Technology Corp. or a third party. 2. Renesas Technology Corp. assumes no responsibility for any damage, or infringement of any third-party's rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or circuit application examples contained in these materials. 3. All information contained in these materials, including product data, diagrams, charts, programs and algorithms represents information on products at the time of publication of these materials, and are subject to change by Renesas Technology Corp. without notice due to product improvements or other reasons. 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