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参数资料
| 型号： | M48T212Y-85MH6TR |
| 厂商： | 意法半导体 |
| 英文描述： | 5V/3.3V TIMEKEEPER[ CONTROLLER |
| 中文描述： | 5V/3.3V计时[控制器 |
| 文件页数： | 17/23页 |
| 文件大小： | 150K |
| 代理商： | M48T212Y-85MH6TR |
17/23
M48T212Y, M48T212V
BATTERY LOW WARNING
The M48T212Y/V automatically performs battery
voltage monitoring upon power-up and at factory-
programmed time intervals of approximately 24
hours. The Battery Low (BL) bit, Bit D4 of Flags
Register 0h, will be asserted if the battery voltage
is found to be less than approximately 2.5V. The
BL bit will remain asserted until completion of bat-
tery replacement and subsequent battery low
monitoring tests, either during the next power-up
sequence or the next scheduled 24-hour interval.
If a battery lowis generated during a power-up se-
quence, this indicates that the batteryis belowap-
proximately 2.5 volts and may not be able to
maintain data integrity in the SRAM. Data should
be considered suspect and verified as correct. A
fresh battery should be installed.
If a battery low indication is generated during the
24-hour interval check, this indicates that the bat-
tery is near end of life. However, data is not com-
promised due to the fact that a nominal Vcc is
supplied. In order to insure data integrity during
subsequent periods of battery back-up mode, the
battery should be replaced. The SNAPHAT bat-
tery/crystal top should be replaced with V
CC
pow-
ering the device to avoid data loss.
Note
: this will cause the clock to lose time during
the time interval the battery crystal is removed.
The M48T212Y/V only monitors the battery when
a nominal Vcc is applied to the device. Thus appli-
cations which require extensive durations in the
battery back-up mode should be powered-up peri-
odically (at least once every few months) in order
for this technique to be beneficial.
Additionally, if a battery low is indicated, data in-
tegrity should be verified upon power-up via a
checksum or other technique.
Table 14. Reset AC Characteristics
(T
A
= 0 to 70
°
C; V
CC
= 3V to 3.6V or V
CC
= 4.5V to 5.5V)
Symbol
Note: 1. Pulse width less than 50ns will result in no RESET(for noise immunity).
2. Pulse width less than 20ms will result in no RESET (for noise immunity).
3. C
L
= 5pF (see Figure 4).
Table 15. SNAPHAT Battery Table
Parameter
Min
Max
Unit
t
R1(1)
RSTIN1 Low to RSTIN1 High
200
ns
t
R2(2)
RSTIN2 Low to RSTIN2 High
100
ms
t
R1HRH(3)
RSTIN1 High to RST High
40
200
ms
t
R2HRH(3)
RSTIN2 High to RST High
40
200
ms
Part Number
Description
Package
M4T28-BR12SH
Lithium Battery (48mAh) SNAPHAT
SH
M4T32-BR12SH
Lithium Battery (120mAh) SNAPHAT
SH
Figure 12. RSTIN1 & RSTIN2 Timing Waveforms
AI02642
RSTIN1
RST
(1)
RSTIN2
tR1
tR1HRH
tR2
tR2HRH
相关PDF资料 |
PDF描述 |
|---|---|
| M48T212Y | 5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212YMH | 5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-85MH1 | Shielded Multiconductor Cable; Number of Conductors:6; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Conductor Material:Copper; Temperature Max:80 C RoHS Compliant: Yes |
| M48T212Y-85MH1TR | Multiconductor Cable; Number of Conductors:7; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Conductor Material:Copper; Temperature Max:80 C RoHS Compliant: Yes |
| M48T212Y-85MH6 | Shielded Multiconductor Cable; Number of Conductors:7; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Shielding Material:Aluminum Foil/Polyester Tape/Tinned Copper Braid RoHS Compliant: Yes |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212YMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212YSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T248V | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 1024K TIMEKEEPER SRAM with PHANTOM |
| M48T248V-70PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 1024K TIMEKEEPER SRAM with PHANTOM |
| M48T248V-70PM1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 1024K TIMEKEEPER SRAM with PHANTOM |
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