参数资料
| 型号： | SX8121ISTRT |
| 厂商： | Semtech |
| 文件页数： | 10/17页 |
| 文件大小： | 0K |
| 描述： | IC PWR MGMT SINGLE CELL 8-SOIC |
| 标准包装： | 1 |
| 应用： | 通用 |
| 电流 - 电源： | 30µA |
| 电源电压： | 0.9 V ~ 2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 标准包装 |
| 其它名称： | SX8121ISDKR |
SX8120/21
1V Motor/LED control timer
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
5
Operating Modes
VDD
1.05V Switch ON
0.95V Switch OFF
0.9V
POR
Hysteresis
0.6V
SAFE
LOW
BATT
ACTIVE or SLEEP
LOW
BATT
SAFE
time
Figure 4. Operating modes vs battery voltage 1
1. Typical values.
5.1
5.2
5.3
5.4
Safe Mode
The internal system goes in Safe mode as soon as the battery voltage is above 0.6-0.7V. In this mode all pins
are set in high impedance and are inactive. This guarantees a safe start-up when a battery is inserted. The
power consumption is 10uA max and prevents the battery from leaking when it is empty.
Low Batt mode
The device is in Low Batt mode as soon as the battery voltage reaches the 0.9V POR threshold. In this mode,
each output pin is in a static state. The device will not react to the BUTTON pin. The LED pin is set to ground.
The MOTOR pin is off according to POLARITY pin, meaning at VSS if POLARITY was set to ‘1’ or at VDD if
POLARITY was set to ‘0’. The chip internally checks the VDD voltage each seconds and wakes up to Sleep
mode when VDD > V ON ( 1.05V typical). NIMH pin is forced high until the VDD voltage goes below 0.9V (back
to Safe mode), or above 1.41V (battery full).
Sleep mode
The MOTOR pin is off according to POLARITY pin, meaning at VSS if POLARITY was set to ‘1’ or at VDD if
POLARITY was set to ‘0’. LED pin is tied to ground. The chip reacts to the BUTTON pin and if a low pulse occurs,
the device switch to Active mode. NIMH pin is set according to VDD voltage (see 4.5. NiMH pin ).
Active Mode
The MOTOR pin is on according to the POLARITY pin, meaning at VDD if POLARITY was set to ‘0’ or at VSS if
POLARITY was set to ‘1’. The LED pin send 43kHz burst. The internal system is in Active mode until the timeout
occurs or the button is pulsed again and then goes back to the Sleep mode. NIMH pin is set according to VDD
voltage (see 4.5. NiMH pin ).
ACS - Revision 2.2
August 2010
Page 10
www.semtech.com /products/
? Semtech Corp.
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