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NTP53X2 Datasheet(PDF) 54 Page - NXP Semiconductors |
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NTP53X2 Datasheet(HTML) 54 Page - NXP Semiconductors |
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54 / 133 page  NXP Semiconductors NTP53x2 NTAG 5 link - NFC Forum-compliant I2C bridge NTP53x2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Product data sheet Rev. 3.3 — 3 July 2020 COMPANY PUBLIC 544533 54 / 133 Table 95. PWM and GPIO Configuration Register Definition (PWM_GPIO_CONFIG_1_REG) Access Bit Name NFC Acc. I2C Acc. Value Description 7 6 PWM1_PRESCALE R/W R 00b Pre-scalar configuration for PWM1 channel 5 4 PWM0_PRESCALE R/W R 00b Pre-scalar configuration for PWM0 channel 00b 6-bit resolution 3 01b 8-bit resolution 10b 10-bit resolution 2 PWM1_RESOLUTION_CONF R/W R 11b 12-bit resolution 00b 6-bit resolution 1 01b 8-bit resolution 10b 10-bit resolution 0 PWM0_RESOLUTION_CONF R/W R 11b 12-bit resolution 8.1.4.5 Pulse Width Modulation duty cycle register The PWM duty cycle maybe changed during one session from NFC perspective (see Section 8.1.3.16). As long as the I2C slave use case is enabled, these settings can also be done from I2C perspective. 8.1.4.6 Watch Dog Timer register Watch Dog Timer register settings are read only (see Section 8.1.3.17). 8.1.4.7 Energy harvesting register Energy harvesting registers may be used to enable energy harvesting during one NFC session. In this case, EH_ENABLE bit of EH_CONFIG byte in block 3Dh is set to 0b. Required EH_VOUT_I_SEL and EH_VOUT_V_SEL need to be set in that EH_CONFIG byte. Desired energy harvesting mode (EH_MODE) needs to be configured in CONFIG_0 byte of block 37h. In case of energy harvesting is enabled already during boot (EH_ENABLE bit of EH_CONFIG is 1b), or energy harvesting is not used at all, this register byte gives no information. Setting EH_TRIGGER to 1b is needed to trigger power detection. Polling for bit EH_LOAD_OK should be used to check, if sufficient energy is available. Only if EH_LOAD_OK = 1b, energy harvesting may be enabled via session registers by writing 09h to this byte. There is only read only access from I2C perspective. Details can be found in energy harvesting section (see Section 8.5). |
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