SAA1305T Datasheet, PDF (14/32 Pages) Panasonic Semiconductor – On/off logic IC

Philips Semiconductors
On/off logic IC
Product specification
SAA1305T
Table 8 Definition of the control register bits
BIT
DESCRIPTION
7 part of the mask register; corresponds to input D7; a logic 1 disables input D7 (no influence on pin CHI)
6 part of the mask register; corresponds to input D6; a logic 1 disables input D6 (no influence on pin CHI)
5 part of the mask register; corresponds to input D5; a logic 1 disables input D5 (no influence on pin CHI)
4 part of the mask register; corresponds to input D4; a logic 1 disables input D4 (no influence on pin CHI)
3 content of bits 3 and 2 corresponds with the pulse width of the reset pulse output; see Table 9
2
1 control bit for pin ON/OFF; a logic 0 sets pin ON/OFF to V_SS; a logic 1 sets pin ON/OFF to V_DD
0 control bit (ENABLE-RESET) for the IC modes; only setting a logic 0 is possible; standby mode with disabled
Watchdog timer, enabled reset generation, ON/OFF = LOW and CHI = 3-state; with the rising edge of the
reset pulse output the IC enters the run mode with enabled Watchdog timer, disabled reset generation,
ON/OFF = HIGH (but controllable via control register bit 1) and CHI = HIGH (is active, not in 3-state)
Table 9 Pulse width of the reset pulse output
BIT 3
0
0
1
1
BIT 2
0
1
0
1
PULSE WIDTH (ms)
20
10
5
1
Table 10 Definition of the LED register bits
BIT
DESCRIPTION
7 bits 7 and 6 are function control bits;
6 ^{see Table 11}
5 no function
4 reset I²C-bus error counter
3 bits 3 and 2 are control bits for the blink LED
2 ^{frequency (output LOW time); see Table 12}
1 bits 1 and 0 are control bits for the blink LED
0 ^{duration time; see Table 13}
Table 11 Function control bits
BIT 7
0
0
1
1
BIT 6
FUNCTION
0 LED output switched to ground
1 blink function according the LED
register bits 0 to 3
0 LED output switched to V_DD
1 blink function according the LED
register bits 0 to 3
Table 12 Control bits for the blink LED frequency
BIT 3
0
0
1
1
BIT 2
0
1
0
1
FREQUENCY
2 Hz (0.5 s)
1 Hz (1 s)
0.67 Hz (1.5 s)
0.5 Hz (2 s)
Table 13 Control bits for the blink LED duration time
BIT 1
0
0
1
1
BIT 0
0
1
0
1
DURATION TIME (ms)
20
30
40
50
2004 Jan 15
14