Datasheet

© 2005 Microchip Technology Inc. DS21935A-page 13
TCN75A
4.3.4 SENSOR CONFIGURATION
REGISTER (CONFIG)
The TCN75A has an 8-bit read/write Configuration
register that allows the user to select the different
features. These features include shutdown, ALERT
output select as comparator or interrupt output, ALERT
output polarity, fault queue cycle, temperature mea-
surement resolution and One-shot mode (single con-
version while in shutdown). These functions are
described in detail in the following sections.
REGISTER 4-5: CONFIGURATION REGISTER (CONFIG)
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
One-Shot Resolution Fault Queue ALERT
Polarity
COMP/
INT
Shut-
down
bit 7 bit 0
bit 7 ONE-SHOT bit
1 = Enabled
0 = Disabled (Power-up default)
bit 5-6 ΣΔ ADC RESOLUTION bits
00 = 9 bit (Power-up default)
01 = 10 bit
10 = 11 bit
11 = 12 bit
bit 3-4 FAULT QUEUE bits
00 = 1 (Power-up default)
01 =2
10 =4
11 =6
bit 2 ALERT POLARITY bit
1 = Active-high
0 = Active-low (Power-up default)
bit 1 COMP/INT bit
1 = Interrupt mode
0 = Comparator mode (Power-up default)
bit 0 SHUTDOWN bit
1 = Enable
0 = Disable (Power-up default)
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