参数资料
| 型号： | SC824ULTRT |
| 厂商： | Semtech |
| 文件页数： | 16/29页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC824ULDKR |
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SC824
Applications Information (continued)
Monitor State
Upon termination (charge timer disabled) or time-out of
the top-off timer (charge timer enabled), the charger will
enter the monitor state. If the battery voltage falls below
the recharge threshold (V CV - V ReQ ) while in the monitor
state, the charger will automatically initiate a re-charge
cycle. This operation will turn on the charger output, but
will not assert the STAT1 output. A recharge cycle is
subject to normal timer operation if the timer is enabled.
The battery leakage current during monitor state is no
more than 1 μ A over temperature and typically less than
0.1 μ A at room temperature.
The SC824 can be forced out of the monitor state by dis-
abling and re-enabling the charger using the EN_NTC pin.
This operation will initiate a new charge cycle. This forced
re-charge behavior can be used for periodically testing
the battery state-of-charge and topping off the battery
without requiring the battery to discharge to the auto-
matic re-charge voltage. A single CPU instruction cycle is
a suffi cient disable hold-time to initiate a re-charge cycle.
The recommended EN_NTC network is a fixed-value pull-
up resistor (designated R NPU ) from the EN_NTC pin to the
VSYS pin, and the battery pack NTC thermistor (designated
R NTC ) from the EN_NTC pin to ground. In this configura-
tion, an increasing battery temperature produces a
decreasing NTC pin voltage.
When V EN_NTC is greater than the high (cold) threshold (but
below the No-Battery detector threshold) or less than the
low (hot) threshold (but above the disable threshold), the
charge cycle is suspended by turning off the output. This
suspends but does not reset the charge timer, in any timer
stage, and a charging fault is indicated by asserting
(pulling low) STAT1 and releasing STAT0. Hysteresis is
included for both high and low NTC thresholds to avoid
chatter at the NTC temperature fault thresholds. When
V EN_NTC returns to the Temperature-OK-to-Charge range,
the charge timer resumes, STAT0 and STAT1 are asserted,
and the charge cycle continues. The charge timer will
expire when the output on-time exceeds the timer setting,
regardless of how long it has been disabled due to an NTC
fault.
Following termination, the host processor can schedule a
forced re-charge at any desired interval. Forced re-charge
will assert the STAT1 output, which will remain on for 20
seconds following termination, regardless of whether the
charge timer is enabled.
VSYS pin
The voltage of the VSYS pin is regulated from the VIN input
and is present only when VIN is powered. A capacitor of at
least 1μF should be connected from VSYS to ground near
the pin. Capacitance must be rated at the expected bias
All EN_NTC input thresholds are proportional to the VSYS
pin voltage (V VSYS ). See the Block Diagram. When the rec-
ommended external NTC circuit shown in the Block
Diagram is used, the external EN_NTC pin voltage is also
proportional to V VSYS , with the proportionality varying with
the thermistor resistance. This ensures that all EN_NTC
thresholds are insensitive to V VSYS . The ratiometric hot and
cold thresholds are given by the parameters RT NTC_HF and
RT NTC_CR . EN_NTC pin voltage V EN_NTC between RT NTC_HF ×V VSYS
and RT NTC_CR ×V VSYS enables charging. See Table 1.
voltage of 4.6V.
Table 1 — EN_NTC Pin Ratiometric Thresholds
The internal CC timer is selected when the RTIME pin is
connected to VSYS. VSYS provides an external voltage
reference and supply for the NTC network. The total exter-
nal load on the VSYS pin should not exceed 1mA.
% of V VSYS
RT NTC_NBR = 95%
Range
No-Battery
NTC Cold Fault
EN_NTC Interface
The EN_NTC pin is the interface to a battery pack tempera-
ture sensing Negative Temperature Coefficient (NTC)
thermistor, which can be used to suspend charging if the
battery pack temperature is outside of a safe-to-charge
range. The EN_NTC interface also often serves as a charger
V EN_NTC
Ratiometric
Thresholds
RT NTC_CR = 75%
RT NTC_HF = 30%
RT NTC_DIS = 10%
NTC Temperature-
OK-to-Charge
NTC Hot Fault
Charger Disabled
disable input and as a battery removal detector.
16
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