参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 32/159页
文件大小: 0K
描述: IC POWER MANAGEMENT 206MAPBGA
标准包装: 160
应用: 通用
电源电压: 1.8 V ~ 4.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 206-LFBGA
供应商设备封装: 206-MAPBGA(13x13)
包装: 托盘
Functional Block Description
7.3.3
Coin Cell Battery Backup
The LICELL pin provides a connection for a coin cell backup battery or supercap. If the main battery is deeply discharged,
removed, or contact-bounced (i.e., during a power cut), the RTC system and coin cell maintained logic will switch over to the
LICELL for backup power. This switch over occurs for a BP below 1.8 V threshold with LICELL greater than BP. A small capacitor
should be placed from LICELL to ground under all circumstances.
Upon initial insertion of the coin cell, it is not immediately connected to the on chip circuitry. The cell gets connected when the IC
powers on, or after enabling the coin cell charger when the IC was already on.
The coin cell charger circuit will function as a current-limited voltage source, resulting in the CC/CV taper characteristic typically
used for rechargeable Lithium-Ion batteries. The coin cell charger is enabled via the COINCHEN bit. The coin cell voltage is
programmable through the VCOIN[2:0] bits. The coin cell charger voltage is programmable in the ON state where the charge
current is fixed at ICOINHI.
If COINCHEN=1 when the system goes into Off or User Off state, the coin cell charger will continue to charge to the predefined
voltage setting but at a lower maximum current ICOINLO. This compensates for self discharge of the coin cell and ensures if and/
or when the main cell gets depleted, the coin cell will be topped off for maximum RTC retention. The coin cell charging will be
stopped for the BP below UVDET. The bit COINCHEN itself is only cleared when an RTCPORB occurs.
Table 19. Coin Cell Voltage Specifications
VCOIN[2:0]
000
001
010
011
100
101
110
111
Output Voltage
2.50
2.70
2.80
2.90
3.00
3.10
3.20
3.30
Table 20. Coin Cell Electrical Specifications
Characteristics noted under conditions BP = 3.6 V, V BUS = 5.0 V, - 40 ? C ? T A ? 85 ? C, unless otherwise noted. Typical values
at BP = 3.6 V and T A = 25 °C under nominal conditions, unless otherwise noted.
Symbol
Characteristic
Min
Typ
Max
Unit
Notes
COIN CELL CHARGER
V LICELLACC Voltage Accuracy
-
100
-
mV
I LICELLON
I LICELLOFF
I LICELACC
CO LICELL
Coin Cell Charge Current in On and Watchdog modes ICOINHI
Coin Cell Charge Current in Off, cold start/warm start, and Low Power Off
modes (User Off / Memory Hold) ICOINLO
Current Accuracy
LICELL Bypass Capacitor
LICELL Bypass Capacitor as coin cell replacement
-
-
-
-
-
60
10
30
100
4.7
-
-
-
-
-
? A
? A
%
nF
? F
MC34708
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
32
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