[AK4438]
■ Error Detection
Three types of error can be detected in I2C mode when the LDOE pin = “H”. (Table 19).When the error is
detected, LDO is powered down and writing into the control registers is prohibited. Once the error is
detected the AK4438 does not return to normal operation automatically even if the error condition is
removed so restart the AK4438 by the PDN pin. In I2C mode, the AK4438 does not generate
acknowledge (ACK) in error status.
No Error
Error Condition
1
Internal Reference Voltage Error Internal reference voltage is not powered up.
2
3
LDO Over Voltage Detection
LDO Over Current Detection
LDO voltage > 1.5V (typ.)
LDO current < 51mA (typ.)
Table 19. Error Detection
■ System Reset
The AK4438 should be reset once by bringing the PDN pin = “L” upon power-up. Power-down state of the
reference voltage such as LDO and VCOM will be released by PDN pin = “H” and writing into resisters is
valid in 1ms. The AK4438 is in power-down state until MCLK and LRCK input.
016001925-E-00
2016/03
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AKM [ ASAHI KASEI MICROSYSTEMS ]
