FN8102.3 April 14, 2006 The summary of conditions for backup battery operation is given in Table 9: Table 9. Battery Backup Operation *since Vb" />
參數(shù)資料
型號(hào)： X1288V14Z
廠商： Intersil
文件頁(yè)數(shù)： 18/27頁(yè)
文件大?。?/td> 0K
描述： IC RTC/CAL/CPU SUP EE 14-TSSOP
標(biāo)準(zhǔn)包裝： 95
類型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，閏年，監(jiān)控器，監(jiān)視計(jì)時(shí)器
時(shí)間格式： HH:MM:SS:hh（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 4.5 V ~ 5.5 V
電壓 - 電源，電池： 1.8 V ~ 5.5 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 14-TSSOP
包裝： 管件
25
FN8102.3
April 14, 2006
The summary of conditions for backup battery operation is given in Table 9:
Table 9. Battery Backup Operation
*since Vback>2.65V is higher than Vtrip, the battery is powering the entire device
Referring to Figure 20, Vtrip applies to the “Internal
Vcc” node which powers the entire device. This means
that if Vcc is powered down and the battery voltage at
Vback is higher than the Vtrip voltage, then the entire
chip will be running from the battery. If Vback falls to
lower than Vtrip, then the chip shuts down and all out-
puts are disabled except for the oscillator and time-
keeping circuitry. The fact that the chip can be
powered from Vback is not necessarily an issue since
standby current for the RTC devices is <2A for this
mode (called “main timekeeping current” in the data
sheet). Only when the serial interface is active is there
an increase in supply current, and with Vcc powered
down, the serial interface will most likely be inactive.
One way to prevent operation in battery backup mode
above the Vtrip level is to add a diode drop (silicon
diode preferred) to the battery to insure it is below
Vtrip. This will also provide reverse leakage protection
which may be needed to get safety agency approval.
One mode that should always be avoided is the opera-
tion of the RTC device with Vback greater than both
Vcc and Vtrip (Condition 2d in Table 9). This will cause
the battery to drain quickly as serial bus communica-
tion and non-volatile writes will require higher supplier
current.
PERFORMANCE DATA
IBACK Performance
1. Example Application, Vcc=5V, Vback=3.0V
Condition
Vcc
Vback
Vtrip
Iback
Reset
Notes
a. Normal Operation
5.00
3.00
4.38
<<1A
H
b. Vcc on with no battery
5.00
0
4.38
0
H
c. Backup Mode
0–1.8
1.8-3.0
4.38
<2A
L
Timekeeping
only
2. Example Application, Vcc=3.3V,Vback=3.0V
Condition
Vcc
Vback
Vtrip
Iback
Reset
a. Normal Operation
3.30
3.00
2.65
<<1A
H
b. Vcc on with no battery
3.30
0
2.65
0
H
c. Backup Mode
0–1.8
1.8–3.0*
2.65
<2A*
L
Timekeeping
only
d. UNWANTED - Vcc ON, Vback
powering
2.65 - 3.30
> Vcc
2.65
up to 3mA
H
Internal
Vcc=Vback
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
IBACK vs. Temperature
Multi-Lot Process Variation Data
Temperature °C
-40
25
60
85
I BACK
(A)
3.3V
1.8V
X1288
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