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Part Number:
SAA1305T
Category：
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Vendor：
PHILIPS
Package Cooled：
D/C：
Description：
The SAA1305T is an on/off logic IC, intended for use in car radios to interface betw

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General Description

The SAA1305T is an on/off logic IC, intended for use in car radios to interface between a microcontroller and various
input signals such as ignition, low supply detection, on/off key and external control signals.

The SAA1305T can replace an existing on/off logic built-up with discrete components.

The SAA1305T contains 8 inputs with accurate Schmitt triggers and clamp circuits. The main function of this IC is an intelligent I/O expander with 2 modes of operation:
1. Normal I/O expander: the microcontroller (master) is running and the SAA1305T acts like a slave.
2. Sleep mode of the total application: the microcontroller is stopped and the SAA1305T acts like a master. During an event, the microcontroller is awakened.

The communication with the IC is performed via the I²C-bus (400 kHz). Extra functions of the SAA1305T are:
· LED blinker circuit
· One-day watch
· Watchdog timer.

Maximum Ratings

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
V_DD	supply voltage	operating	-0.5	+6.5	V
I_q	quiescent supply current	V_DD = 5 V; standby mode	-	200	μA
V_I(n)	input voltage on pins SDA, SCL, RES, WD and TS D0 to D7	f_osc = 32 kHz with 5 kΩ series resistor	-0.5 -0.5	+6.5 +17	V V
V_O(n)	output voltage on pins CHI, RP, ON/OFF and LED	f_osc = 32 kHz	-0.5	+6.5	V
f_SCL(max)	maximum SCL clock frequency		-	400	kHz
T_vj	virtual junction temperature		-	150	°C
T_stg	storage temperature		-65	+150	°C
T_amb	ambient temperature		-40	+85	°C

Features

· 8 accurate Schmitt trigger inputs with clamp circuits
· Very low quiescent current
· Reset generator circuit
· Changed information output
· On/off output to control a regulator IC which supplies the microcontroller
· 32.768 kHz RC oscillator and/or a 32.768 kHz crystal oscillator
· No delayed reset needed (start-up behaviour oscillator fixed by internal logic)
· Watchdog timer function
· Blinking LED oscillator with drive circuit for LED
· Watch function.