Device Register and Operation

The Sleep Time register (register address 0x00) is the only device register that a microcontroller can read from and write

to. The register content and operations are shown in Figure 10.

BIT 7

BUS STATUS

OUT

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

SLEEP TIME INDEX (SEE TABLE 1 FOR SLEEP TIME VALUES)

BIT 7: read only, I2C bus status.

If BIT 7 = 0, I2C write operation is allowed. If BIT 7 = 1, I2C write operation is not allowed.

BIT6: clear-after-write register.

If BIT 6 = 0, OUT does not change. If BIT 6 = 1, de-assert OUT after write operation.

Figure 10. Device Register and Operation

deassert OUT. Any register write overrides the sleep time with the new register value. It's recommended to read the

register first and then mask bit 6 and write with the new register value to keep the sleep time unchanged.

if OUT is asserted or deasserted.

Register Write Operation

To write the sleep time register, the master sends a start condition on the bus with the MAX16163/MAX16164 address as

well as the last bit (the R/W bit) set to 0, which signifies a write. After the MAX16163/MAX16164 sends the acknowledge

bit, the master then sends the register address (0x00). The MAX16163/MAX16164 acknowledges again, letting the

master know it is ready. After this, the master starts sending the register data to the MAX16163/MAX16164. The master

terminates the transmission with a STOP condition. Figure 11 shows the format of a single write register operation.

Figure 11. Register Write Operation

MAX16163/MAX16164

nanoPower On/Off Controller with Programmable

Sleep Time

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