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PCA9450 Folha de dados(PDF) 24 Page - NXP Semiconductors |
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PCA9450 Folha de dados(HTML) 24 Page - NXP Semiconductors |
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24 / 96 page  NXP Semiconductors PCA9450 Power management IC for i.MX 8M application processor family PCA9450 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved. Product data sheet Rev. 1.0 — 19 November 2019 24 / 96 aaa-035719 10 F 22 F 0.47 H BUCK1 3A Dual Phase Ctrl i.MX8 Nano PCA9450B DVS INB13 SYS SYS VDD_SOC VDD_VPU VDD_GPU VDD_DRAM LX1 R_SNSP1 EN BUCK3 3A DVS INB13 LX3 R_SNSP3_CFG EN 10 F 22 F 0.47 H 22 F 0.47 H BUCK1 3A Dual Phase Ctrl i.MX8 Plus PCA9450C DVS INB13 SYS SYS VDD_SOC VDD_VPU VDD_GPU VDD_DRAM LX1 R_SNSP1 EN BUCK3 3A DVS INB13 LX3 R_SNSP3_CFG EN Figure 16. BUCK1/3 configuration 7.6.2 LDO and load switch The PCA9450 has five LDOs and one load switch. LDO1 and LDO2 are supposed to supply SNVS core in application processor. These two LDOs feature ultra-low quiescent current, 2 μA typical, since they are always ON when VSYS is valid. For all LDO and the load switch, each has designated active discharge resistor configurable through I2C. Table 18. LDO summary LDO# INPUT PIN Default VOUT [V] VOUT range [V] Step size [mV] Default ON/ OFF Current rating [mA] LDO1 INL1 1.8 1.6-1.9, 3.0-3.3 100 ON 10 LDO2 INL1 0.85 0.8 – 1.15 50 ON 10 LDO3 INL1 1.8 0.8 - 3.3 100 ON 300 LDO4 INL1 0.9 0.8 - 3.3 100 ON [1] 200 LDO5 INL1 3.3/1.8 1.8 - 3.3 100 ON 150 SW SWIN - - - OFF 400 [1] ON by default in PCA9450A, OFF by default in PCA9450B and PCA9450C 7.7 32 kHz Crystal Oscillator Driver The PCA9450 consists of a crystal oscillator driver with an external load capacitor and CLK_32K_OUT buffer referenced to LDO1 voltage. When VSYS exceeds POR threshold and internal power VINT is good, internal 32 kHz oscillator and 32.768 kHz crystal oscillator start oscillating. Crystal oscillator typically takes few seconds to be stabilized. PCA9450 outputs the internal 32 kHz RC oscillator initially, while internal counter counts crystal oscillator output in tRTC_Tran after RTC_RESET_B is released. If the counter reaches 100, then CLK_32K_OUT buffer input is switched to the external crystal oscillator from internal 32 kHz oscillator. Clock stretch is applied during this clock source transition to prevent unwanted glitch. If external 32.768 kHz crystal oscillator is not populated, CLK_32K_OUT pin outputs 32 kHz clock from internal 32 kHz oscillator. For more detailed information on selecting crystal oscillator and load capacitance, refer to Section 9.2.2. |
Nº de peça semelhante - PCA9450 |
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Descrição semelhante - PCA9450 |
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