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RT5509 数据表(PDF) 15 Page - Richtek Technology Corporation |
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RT5509 数据表(HTML) 15 Page - Richtek Technology Corporation |
15 / 58 page RT5509 Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation DS5509-00 August 2017 www.richtek.com 15 Mode Transition The state machine of mode transition is shown in Figure 6. “Mute” mode is not shown in this figure since it can be considered as the sub-mode of the normal Operating mode, only with zero input signal. The “Off” mode is usually used only in the power down sequence, and is depicted in the next sub-clause. After power on, the control bit will always be reset to PWDN mode. PWDN OP FAULT SUSP VDDD, VBAT valid = 1 PWDN = 0 (I 2 C) BCK valid ? BCK valid = 1 BCK valid = 0 Fault ? OTP/OCP/OVP/UVP = 1 OTP/OCP/OVP/UVP = 0 Fault ? OTP/OCP/OVP/UVP = 0 OTP/OCP/OVP/UVP = 1 PWDN = 1 (I 2 C) OTP/OCP/OVP/UVP = 1 OTP/OCP/OVP/UVP = 0 (Check every 200ms) PWDN = 1 (I 2 C) PWDN = 1 (I 2 C) Figure 6. Mode Transition Power ON Sequence The power on sequence is shown in Figure 7. After power is valid, two groups of control signals should be set, without specific order requirement between these two groups : 1. I2C : PWDN, AMPE, SPKE should be programmed. These three bits can be programmed by single command since they are at the same byte address. 2. I2C : I2SDIS, I2SDF, I2SFS set for reference clock selection for PLL. I2S : BCK should be valid on the specified interface. If the PWDN is set to 0 before the BCK valid, it will go to SUSP mode automatically. The output of amplifier will be valid after entering OP mode, signal ramp up will always be implemented when the mode transits from PWDN or SUSP mode to OP mode. Power OFF Sequence The power off sequence is shown in Figure 8. PWDN mode should be set before the power supplies disconnected. To avoid pop or click, the amplifier should be turned off by setting AMPE = 0 before power down. Soft muting will also be enabled automatically if AMPDS bit is set to 1, which further ensures a pop-free procedure. |
类似零件编号 - RT5509 |
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类似说明 - RT5509 |
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