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AW3643CSR датащи(PDF) 17 Page - Shanghai awinic technology co.,ltd |
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AW3643CSR датащи(HTML) 17 Page - Shanghai awinic technology co.,ltd |
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17 / 39 page ![]() AW3643 Jan 2018 V1.4 www.awinic.com.cn 17 Copyright © 2016 SHANGHAI AWINIC TECHNOLOGY CO., LTD FUNCTIONAL BLOCK DIAGRAM Control Logic /Regsiter UVLO OSC 2/4Mhz IVFM NTC monitor I 2C Interface Thermal Shutdown Protection FB Select OUT LED1 LED2 SW IN GND Boost Controller OVP VOVP Current Limit TORCH/TEMP SDA SCL INTC=50uA LED & OUT Short Detect AW3643 TX HWEN STROBE FEATURE DESCRIPTION HWEN & I2C INTERFACE AW3643 has a logic input HWEN pin to enable/disable the device. When HWEN is set low, the device goes into shutdown mode, the I2C interface is disabled and all I2C registers are reset to default. In shutdown mode the device does not respond to any I2C command. When HWEN is set high, the device goes into standby mode, the I2C interface is enabled, and the device can respond to I2C command. There are two kinds of power-up sequences, shown in Figure 45 and Figure 46. If HWEN is tied to IN pin in application, once IN goes above around VPOR (2.0V), HWEN should stay high for at least twait=2ms time before any I2C command can be accepted. If HWEN is driven by a GPIO, once HWEN goes from low to high, HWEN should stay high for at least twait=2ms time before any I2C command can be accepted. HWEN=IN I 2C command twait≥2ms Fig 45 Power-Up Sequence with HWEN Tied to IN |
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