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参数资料
| 型号： | LTC2942CDCB-1#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 3 MM, LEAD FREE, PLASTIC, MO-229TBD, DFN-6 |
| 文件页数： | 16/16页 |
| 文件大小： | 230K |
| 代理商： | LTC2942CDCB-1#TRPBF |
LTC2942-1
29421f
applicaTions inFormaTion
The hard-coded bit A[7] of the status register enables the
host to distinguish the LTC2942-1 from the pin compat-
ible LTC2941, allowing the same software to be used with
both devices.
Control Register (B)
The operation of the LTC2942-1 is controlled by program-
ming the control register. Table 3 shows the organization
of the 8-bit control register B[7:0].
Table 3. Control Register B
BIT
NAME
OPERATION
Default
B[7:6] ADC Mode
[11] Automatic Mode.
Performs voltage and temperature
conversion every second.
[10] Manual Voltage Mode.
Performs single voltage
conversion, then sleeps.
[01] Manual Temperature Mode.
Performs single temperature
conversion, then sleeps.
[00] Sleep.
[00]
B[5:3] Prescaler M
Sets coulomb counter prescaling
factor M between 1 and 128.
Default is 128.
M = 2(4 B[5] + 2 B[4] + B[3])
[111]
B[2:1] AL/CC Configure Configures the AL/CC pin.
[10] Alert Mode.
Alert functionality enabled.
Pin becomes logic output.
[01] Charge Complete Mode.
Pin becomes logic input and
accepts “charge complete” signal
(e.g., from a charger) to set
accumulated charge register (C,D)
to FFFFh.
[00] AL/CC pin disabled.
[11] Not allowed.
[10]
B[0]
Shutdown
Shut down analog section to
reduce ISUPPLY.
[0]
Power Down B[0]
Programming the last bit B[0] of the control register to 1
sets the analog parts of the LTC2942-1 in power down and
the current consumption drops typically below 1A. All
analogcircuitsaredisabledwhilethevaluesintheregisters
are retained. Note that any charge flowing while B[0] is 1
is not measured and the charge information below 1LSB
of the accumulated charge register is lost.
Alert/Charge Complete Configuration B[2:1]
The AL/CC pin is a dual function pin configured by the
control register. By setting bits B[2:1] to [10] (default)
the AL/CC pin is configured as an alert pin following the
SMBus protocol. In this configuration the AL/CC pin is a
digital output and is pulled low if one of the three mea-
sured quantities (charge, voltage, temperature) exceeds
its high or low threshold or if the value of the accumulated
chargeregisteroverflowsorunderflows.Analertresponse
procedure started by the master resets the alert at the
AL/CC pin. For further information see the Alert Response
Protocol section.
SettingthecontrolbitsB[2:1]to[01]configurestheAL/CC
pin as a digital input. In this mode, a high input on the
AL/CC pin communicates to the LTC2942-1 that the bat-
tery is full and the accumulated charge register is set to
its maximum value FFFFh. Columb counting starts when
the AL/CC pin returns to low level.
If neither the alert nor the charge complete functionality
is desired, bits B[2:1] should be set to [00]. The AL/CC
pin is then disabled and should be tied to GND.
Avoid setting B[2:1] to [11] as it enables the alert and the
charge complete modes simultaneously.
Choosing Coulomb Counter Prescaler ‘M’ B[5:3]
To use as much of the range of the accumulated charge
register as possible the prescaler factor M is chosen based
on battery capacity QBAT:
M
Q
mAh Ah
Q
BAT
≥
=
128
2
0 085
23
16
.
M can be set to 1, 2, 4, 8,... 128 by programming B[5:3] of
thecontrolregisterasM=2(4B[5]+2B[4]+B[3]).Thedefault
value after power up is M = 128 = 27 (B[5:3] = 111). The
maximum battery capacity supported within the prescaler
range is 5.5Ah with M = 128. See the section Extending
Coulomb Counter Range if battery capacity is higher.
Depending on the choice of prescaler factor M, the charge
LSB of the accumulated charge register becomes:
q
mAh
M
LSB = 0 085
128
.
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