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TEA1102T Datasheet(PDF) 7 Page - NXP Semiconductors |
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TEA1102T Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 1999 Jan 27 7 Philips Semiconductors Preliminary specification Fast charge ICs for NiCd, NiMH, SLA and LiIon TEA1102; TEA1102T; TEA1102TS After the ‘fill-up’ period the charge current is not regulated, which means that the output drivers AO and PWM are fixed to zero. When the battery voltage becomes less than 3 V for Lilon and 1.5 V for SLA, the IC enters the fast charge mode again. FUNCTIONAL DESCRIPTION Control logic The main function of the control logic is to support the communication between several blocks. It also controls the charge method, initialization and battery full detection. The block diagram of the TEA1102x is illustrated in Fig.1. Conditioning charge method and initializations At system switch-on, or at battery insertion, the control logic sets the initialization mode in the timer block. After the initialization time the timer program pins can be used to indicate the charging state using several LEDs. The charge method is defined at the same time by the following methods: • If the FCT pin is 0 or 1.25 V, indicating that SLA or LiIon batteries have to be charged, the battery will be charged by limit current and limit voltage regulation. Without identification (FCT pin floating), the system will charge the battery according to the charge characteristic of NiCd and NiMH batteries. • The standby charge method (NiCd and NiMH), trickle charge or voltage regulation, is defined by the input pin Vstb. By biasing this voltage with a set voltage, the output voltage will be regulated to the Vstb set voltage. If this pin is connected to VS, or no NTC is connected the system applies trickle charge. If pin RFSH is connected to ground by depressing the switch, the TEA1102x discharges the battery via an external transistor connected to pin RFSH. The discharge current is regulated with respect to the external (charge) sense resistor (Rsense). End-of-discharge is reached when the battery is discharged to 1 V per cell. Refreshing the battery can only be activated during charging of NiCd and NiMH batteries. When charging LiIon and SLA batteries, discharge before charge is disabled. The inhibit mode has the main priority. This mode is activated when the Vstb input pin is connected to ground. Inhibit can be activated at any charge/discharge state, whereby the output control signals will be zero, all LEDs will be disabled and the charger timings will be set on hold. Table 1 gives an operational summary. Table 1 Functionality of program pins Notes 1. Where X = don’t care. 2. Not low means floating or high. 3. The NTC voltage has been to be less than 3.3 V, which indicates the presence of an NTC. 4. The NTC voltage is outside the window for NTC detection. 5. Vstb has to be floating or set to a battery regulating voltage in accordance with the specification. FUNCTION FCT NTC RFSH Vstb Inhibit X(1) X(1) X(1) low LiIon and SLA detection low X(1) X(1) X(1) Refresh (NiCd and NiMH) not low(2) X(1) low not low ∆T/∆t detection floating note 3 not low not low ∆T/∆t and voltage peak detection high note 3 not low not low Voltage peak detection not low note 4 not low not low Trickle charge at standby not low X(1) not low high not low note 4 not low not low Voltage regulation at standby not low note 3 not low floating(5) |
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