25CS160-HSLASHST datasheet(31/53 Pages) MICROCHIP

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Preliminary

DS20007008B-page 31

25CS160

UNDERVOLTAGE LOCKOUT DETECTOR REGISTER

Note 1: For specific UVLO levels, refer to Table 1-1.

10.2

Accessing the Undervoltage

Lockout Register

10.2.1

READING THE UNDERVOLTAGE

LOCKOUT DETECTOR REGISTER

Reading the Undervoltage Lockout (UVLO) register is

accomplished in a very similar manner to reading the

STATUS register.

The UVLO register is read by asserting the CS pin,

followed by sending in a 15h opcode, which

corresponds to the RUVL instruction on the SI pin.

Upon completion of the opcode, the device will return

the 8-bit register value on the SO pin. The input

conditions of the RUVL instruction are shown in

Figure 10-1.

FIGURE 10-1:

READ UNDERVOLTAGE LOCKOUT REGISTER (

RUVL) SEQUENCE

U-0

R/W

—

UVLOEN

VUVL4

VUVL3

VUVL2

VUVL1

VUVL0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

Unimplemented: Read as ‘0’

bit 5

UVLOEN: Enable Undervoltage Lockout Function

1 = UVLO is enabled

0 = UVLO is not enabled

bit 4-0

VUVL[4:0]: Undervoltage Lockout Detection Level(1)

00000 = Minimum

•

11111 = Maximum

12131415

High-Impedance

SCK

456

RUVL Opcode (15h)

MSb

UVLO Register Data Out

UVLOEN VUVL[4:0] Level Bits

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