- 您现在的位置：买卖IC网 > PDF目录69401 > TA8030S 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PSIP7 PDF资料下载
参数资料
| 型号： | TA8030S |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PSIP7 |
| 封装： | 2.54 MM PITCH, PLASTIC, SIP-7 |
| 文件页数： | 8/13页 |
| 文件大小： | 448K |
| 代理商： | TA8030S |
TA8030S/F
2002-02-27
4
FUNCTIONAL DESCRIPTION
About reset timer operation (See the timing chart)
The following explains the TA8030S/F's voltage monitoring and reset timer operations and how to use these
functions.
(1) Voltage monitoring function (1)
The power input VCC pin of this IC also serves as a voltage detection pin. When the VCC voltage exceeds
4.25V after the IC is powered on, the power-on reset timer starts operating from that point in time. When
the IC is powered off and VCC drops below 4.25V, TC starts discharging and a reset signal is output when
the voltage drops below 40% of VCC. Also, if VCC goes down for some reason during normal operation, a
reset signal is output in the same way as described above, and when VCC is up again and exceeds 4.25V, the
power-on reset timer starts operating from that point in time.
The reset signal is forwarded to the
1
RST
pin.
(2) Voltage monitoring function (2)
The
2
RST
pin outputs a high when the VCC voltage rises above 4.65V and outputs a low when it falls below
4.48V. This function only monitors the voltage operating independently of Voltage monitoring function (1)
and the reset timer function. Since when the voltage drops the
2
RST
output is inverted before a system
reset signal is output from
1
RST
, this function can be used to inhibit writing to memory.
Also, this voltage detection has 3
μs of response delay, td2, to prevent a reset from being generated
inadvertently by minute noise. (For td2, refer to AC Electrical Characteristics.)
(3) Power-on reset timer function
The device is held in a reset state for a predetermined time until the 5V constant voltage stabilizes at
power-on and until the oscillating clock of the CPU, etc. stabilizes before being freed from the reset state.
This time can be set to any desired duration by using the appropriate resistor and capacitor values
connected external to the TC pin.
When the VCC voltage exceeds 4.25V, the system starts charging the capacitor and when this charging
voltage exceeds 2V, the reset signal is inverted to deactivate the reset.
(4) Watchdog timer function
The WD pin between the CPU system and this IC is connected with an differential circuit. This is to ensure
that when a failure occurs in the CPU system, a low signal is input to the WD pin no matter whether the
clock output has stopped in the high or the low state. When the WD pin is fixed high, the watchdog timer
stops operating.
If only the power-on reset timer is needed in your system, connect the WD pin to
1
RST
.
相关PDF资料 |
PDF描述 |
|---|---|
| TA8083AF | BRUSH DC MOTOR CONTROLLER, 0.8 A, PDSO22 |
| TA84007SG | BRUSHLESS DC MOTOR CONTROLLER, 1.2 A, PSIP9 |
| TA84007PQ | BRUSHLESS DC MOTOR CONTROLLER, 2 A, PSIP10 |
| TA8409SG | BRUSH DC MOTOR CONTROLLER, 1 A, PSIP9 |
| TA8409S | BRUSH DC MOTOR CONTROLLER, 1 A, PSIP9 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TA8030SG(5) | 制造商:Toshiba 功能描述:Processor Supervisor 4.25V/4.65V 7-Pin SIP |
| TA803PA4K50FE | 制造商:OHMITE 制造商全称:Ohmite Mfg. Co. 功能描述:Power Chip Thick Film on Alumina Substrate |
| TA803PA4K50JE | 制造商:OHMITE 制造商全称:Ohmite Mfg. Co. 功能描述:Power Chip Thick Film on Alumina Substrate |
| TA803PA4K50KE | 制造商:OHMITE 制造商全称:Ohmite Mfg. Co. 功能描述:Power Chip Thick Film on Alumina Substrate |
| TA8-04 | 制造商:Cooper Bussmann 功能描述:A38 TERM BLOCK COVER - Bulk 制造商:COOPER BUSSMANN 功能描述:A38 TERM BLOCK COVER |
发布紧急采购，3分钟左右您将得到回复。