SML2120

24

2066 6.3 1/22/04

Summit Microelectronics

Configuration Register 4 - Address 0x104

This register is used to set the minimum update delta for Lookup Tables 0 and 1. The contents of this register

are used when the lookup table address translation by the ADC is compared against the previous value. The

current value must differ from the previous stored value by the amount in this register in order for the translation

to occur.

Configuration Register 5 - Address 0x105

This register is used to set the consecutive count source for Lookup Table 0 and 1, the alarm count, the auto-

monitor (AM#) lockout, and auto-monitor hold-off timer.

Bits

Default

Description

76

54321

0

Delta 1

x

0x0

Bits 7:4 determine the minimum update delta for Lookup Table 1. Valid

values range from 0 to 15. 0000 = 0, 1111 = 15.

xDelta 0

0x0

Bits 3:0 determine the minimum update delta for Lookup Table 0. Valid

values range from 0 to 15. 0000 = 0, 1111 = 15.

Table 10. Configuration Register 4 Bitmap

Bits

Default

Description

76

54321

0

COUNT

1

0b00

Indicates the minimum delta between addresses for Lookup table 1. 00

= 0, 11 = 3. Note that there must be at least COUNT1 consecutive

conversions that differ from the previously stored conversion by at least

DELTA 1 (bits 7:4 of Configuration register 4) in order for a new

translation to occur.

COUNT

0

0b00

Indicates the minimum delta between addresses for Lookup table 0.

0b00 = 0, 0b11 = 3. Note that there must be at least COUNT0

consecutive conversions that differ from the previously stored

conversion by at least Delta 0 (bits 3:0 of Configuration register 4) in

order for a new translation to occur.

0

0b0

ALERT# pin assertion. When this bit is cleared, the ALERT# pin is

asserted by the SML2120 on the first alert event.

1

ALERT# pin assertion. When this bit is set, the ALERT# pin is asserted

by the SML2120 on consecutive alert events.

0

0b1

Assertion of the AM# pin by external logic does lock out interface.

1

Assertion of the AM# pin by external logic does NOT lock out interface.

00

0b0

0.4 ms delay for auto-monitor holdoff timer.

0

1

3.2 ms delay for auto-monitor holdoff timer.

1

0

12.8 ms delay for auto-monitor holdoff timer.

1

1

51.2 ms delay for auto-monitor holdoff timer.

Table 11. Configuration Register 5 Bitmap