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参数资料
| 型号： | M48T212V-70MH1 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封装： | SNAPHAT, PLASTIC, SO-44 |
| 文件页数： | 10/23页 |
| 文件大小： | 150K |
| 代理商： | M48T212V-70MH1 |
M48T212Y, M48T212V
18/23
INITIAL POWER-ON DEFAULTS
Upon application of power to the device, the fol-
lowing register bits are set to a ‘0’ state: WDS,
BMB0-BMB4, RB0-RB1, AFE, ABE, W and FT.
(See Table 16)
POWER SUPPLY DECOUPLING
AND UNDERSHOOT PROTECTION
Note: ICC transients, including those produced by
output switching, can produce voltage fluctua-
tions, resulting in spikes on the VCC bus. These
transients can be reduced if capacitors are used to
store energy, which stabilizes the VCC bus. The
energy stored in the bypass capacitors will be re-
leased as low going spikes are generated or ener-
gy will be absorbed when overshoots occur.
A ceramic bypass capacitor value of 0.1
F is rec-
ommended in order to provide the needed filtering.
In addition to transients that are caused by normal
SRAM operation, power cycling can generate neg-
ative voltage spikes on VCC that drive it to values
below VSS by as much as one volt. These negative
spikes can cause data corruption in the SRAM
while in battery backup mode.
To protect from these voltage spikes, ST recom-
mends connecting a schottky diode from VCC to
Figure 13. Supply Voltage Protection
AI02169
VCC
0.1
F
DEVICE
VCC
VSS
VSS (cathode connected to VCC, anode to VSS).
(Schottky diode 1N5817 is recommended for
through hole and MBRS120T3 is recommended
for surface mount).
Table 16. Default Values
Note: 1. WDS, BMB0-BMB4, RB0, RB1.
2. State of other control bits undefined.
3. State of other control bits remains unchanged.
4. Assuming these bits set to ‘1’ prior to power-down.
Conditi on
W
R
FT
AFE
ABE
WATCHDOG
Register (1)
Initial Power-up
(Battery Attach for SNAPHAT) (2)
0
000
0
Subsequent Power-up / RESET (3)
0
000
0
Power-down (4)
0
001
1
0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212V-70MH1E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212V-70MH1F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212V-70MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-70MH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-70MH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
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