INTEGRATED CIRCUITS DATA SHEET SAA1305T On/off logic IC Product specification Supersedes data of 1998 Sep 04 2004 Jan 15 Philips Semiconductors Product specification On/off logic IC SAA1305T 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 The SAA1305T can replace an existing on/off logic built-up with discrete components. • 32.768 kHz RC oscillator and/or a 32.768 kHz crystal oscillator 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: • No delayed reset needed (start-up behaviour oscillator fixed by internal logic) 1. Normal I/O expander: the microcontroller (master) is running and the SAA1305T acts like a slave. • Watchdog timer function • Watch function. 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. GENERAL DESCRIPTION The communication with the IC is performed via the I2C-bus (400 kHz). Extra functions of the SAA1305T are: • Blinking LED oscillator with drive circuit for LED • LED blinker circuit 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. • One-day watch • Watchdog timer. QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS MIN. 4.5 TYP. 5.0 MAX. 5.5 UNIT VDD supply voltage operating V Iq quiescent supply current VDD = 5 V; standby mode − 130 200 µA fSCL(max) maximum SCL clock frequency − − 400 kHz Tvj virtual junction temperature − − 150 °C ORDERING INFORMATION PACKAGE TYPE NUMBER NAME SAA1305T 2004 Jan 15 SO24 DESCRIPTION plastic small outline package; 24 leads; body width 7.5 mm 2 VERSION SOT137-1 Philips Semiconductors Product specification On/off logic IC SAA1305T BLOCK DIAGRAM handbook, full pagewidth D0 D1 D2 D3 D4 D5 D6 D7 1 COMPARATOR 2 3 4 5 NEW LATCH RESET GENERATOR OLD LATCH SCL 23 9 6 SAA1305T 7 RP ON/OFF VL TIMER 18 20 I2C-BUS INTERFACE LED DRIVER 22 WATCHDOG TIMER 21 16 19 17 14 11 ERROR COUNTER SUPPLY 10 12 15 13 MGR200 LED VSS RES VDD TS WATCH TIMER ALARM TIMER OSCILLATOR XTAL2 XTAL1 3 OSC2 OSC1 Fig.1 Block diagram. 2004 Jan 15 CHI 8 STATUS SDA 24 MASK TST WD Philips Semiconductors Product specification On/off logic IC SAA1305T PINNING SYMBOL PIN DESCRIPTION D0 1 input D0; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI D1 2 input D1; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI D2 3 input D2; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI D3 4 input D3; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI D4 5 input D4; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI D5 6 input D5; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI D6 7 input D6; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI D7 8 input D7; generates a reset pulse on pin RP and a LOW-level voltage on pin CHI ON/OFF 9 on/off output (off is active LOW); for controlling the enable of a separate power supply IC from the microcontroller RES 10 reset input (active LOW); for power-on or system reset for the IC WD 11 Watchdog timer trigger input signal from the microcontroller TS 12 timer start input (active LOW); to trigger the VL (is an undervoltage) timer (250 ms) TST 13 test purpose input; must be connected to VSS OSC1 14 RC oscillator output (32.768 kHz) OSC2 15 RC oscillator input (32.768 kHz) XTAL1 16 crystal oscillator output (32.768 kHz) XTAL2 17 crystal oscillator input (32.768 kHz) SDA 18 I2C-bus serial data input/output; interface to the microcontroller VSS 19 ground supply (0 V) SCL 20 I2C-bus serial clock line input; interface to the microcontroller VDD 21 supply voltage; 5 V ±10% with a current consumption of maximum 200 µA (without LED current) LED 22 light emitting diode output; to drive a LED up to 20 mA (high side switch to VDD) RP 23 reset pulse output CHI 24 change information output (active LOW); note 1 Note 1. The following results in a LOW-level voltage on pin CHI: a) A change on any of the (non-masked) inputs D0 to D7. b) A device reset. c) An alarm or VL timer event. d) An oscillator fault or a failed I2C-bus read sequence after a change information signal. e) A failed Watchdog timer trigger sequence. 2004 Jan 15 4 Philips Semiconductors Product specification On/off logic IC SAA1305T Reset time The pulse time on pin RP is selectable via an I2C-bus command; see Table 8. The default value after Power-on reset is the longest time (20 ms). Selectable pulse times via the control register are: 1, 5, 10 and 20 ms. handbook, halfpage D0 1 24 CHI D1 2 23 RP D2 3 22 LED D3 4 21 VDD D4 5 20 SCL With the rising edge of the reset pulse all inputs, except the Watchdog timer and VL timer, are disabled until the I2C-bus command ENABLE-RESET. Each pulse on pin RP resets the internal I2C-bus interface. 19 VSS D5 6 On/off SAA1305T D6 7 18 SDA D7 8 17 XTAL2 The output signal on pin ON/OFF remains HIGH after a trigger event. Trigger sources are: ON/OFF 9 16 XTAL1 • Alterations on any of the inputs D0 to D7 RES 10 15 OSC2 • An impedance detection WD 11 14 OSC1 • A device reset 13 TST • A VL (is an undervoltage) timer or alarm timer event TS 12 • An oscillator fault. MGR201 In the event of a five time failed Watchdog timer trigger or missed I2C-bus read sequence (after a change information indication), an internal logic circuit will reset pin ON/OFF and set the IC in the standby mode. It is also possible to control pin ON/OFF during the run mode via an I2C-bus command (see Table 8, bit 1). In principal two stable IC modes are possible; see Fig.3: Fig.2 Pin configuration. FUNCTIONAL DESCRIPTION 1. Standby mode: an oscillator fault and the following IC function groups can trigger a reset pulse to enter the run mode; Figure 1 shows the block diagram for the SAA1305T. Details are explained in the subsequent sections. a) Watch (alarm timer). Watch and alarm functions b) Supply (device reset). An internal RAM (watch register) counts automatically the seconds for one-day (one-day reset also automatically). The watch register can be set and read from the I2C-bus. An alarm function is possible via a second RAM (alarm register) and is programmable via the I2C-bus. The alarm timer triggers pin CHI and if enabled the reset pulse on pin RP. After a device reset the content of the alarm register is FFFFH (alarm function is disabled) and the content of watch register is 0000H. c) Inputs D0 to D7 (a change on any of these inputs or an impedance detection). The Watchdog timer and the VL timer are disabled in the standby mode. 2. Run mode: only the Watchdog timer (WD), an oscillator fault, a missed I2 C-bus communication and the reset input (RES) can trigger a reset pulse. It is possible to enter the standby mode via control register bit 0; see Table 8. LED control The dynamic mode or wait mode is possible but can only be started from the run mode (see Section “VL timer”). The I2C-bus interface control (see Table 10) for the LED contains: • Two function control bits • Two control bits for the blink LED frequency • Two control bits for the blink LED duration time. All bits are combined within the LED register. 2004 Jan 15 5 Philips Semiconductors Product specification On/off logic IC SAA1305T handbook, full pagewidth SAA1305T OPERABLE RES = HIGH I2C-bus error counter = 5 Watchdog timer error counter = 5 STANDBY RUN RESET event(3); CHI entry(1) control register bit 0 event(2) VL timer start VL timer end input D0 = logic 1 entry(4) event(5) WAIT entry(6) event(5) oscillator fault RES = LOW MGR202 (1) (2) (3) (4) (5) (6) See Section “Run mode entries”. See Section “Run mode events”. Possible events are: alterations on any of the inputs D0 to D7, an impedance detection, an alarm timer event and an oscillator fault. See Section “Standby mode entries”. Not available. See Section “Wait mode entries”. Fig.3 State diagram for IC modes. RUN MODE ENTRIES WAIT MODE ENTRIES • Reset Watchdog timer error counter • Disable Watchdog timer • Enable Watchdog timer • Reset I2C-bus error counter • Enable VL timer function • Reset Watchdog timer error counter • Generate reset pulse • Start VL timer • Disable reset generation via inputs D0 to D7 changes (inclusive impedance detection) and watch compare • Set pin CHI in 3-state • Set pin ON/OFF to LOW (OFF is active). • Reset I2C-bus interface • Set pin CHI to LOW (LOW = active) STANDBY MODE ENTRIES • Set pin ON/OFF to HIGH (ON is active). • Disable Watchdog timer • Reset Watchdog timer error counter RUN MODE EVENTS • Reset I2C-bus error counter • I2C-bus read and write commands • Disable VL timer function • Watchdog timer reset • Enable reset generation via inputs D0 to D7 changes (inclusive impedance detection) and watch compare • Missed I2C-bus communication after a (CHI) change information signal • Set pin ON/OFF to LOW (OFF is active) • Oscillator fault. 2004 Jan 15 • Set pin CHI in 3-state. 6 Philips Semiconductors Product specification On/off logic IC SAA1305T Due to the fact, that a ‘reset pulse’ signal or a ‘change information’ signal are also possible via the Watchdog timer, VL timer, alarm timer, impedance detection, oscillator fault or after a device reset, the information about these different events is also available via corresponding bits within the status register; see Table 5. Serial I/O I2C-bus interface (slave) operates The hardware of the with a maximum clock frequency of 400 kHz. Inputs Pins D0 to D7 are connected to latches (new register). Each latch contains and stores the input change until the read out via the I2C-bus (read out of new register). A second register (old register, latches) contains the input situation before a ‘reset pulse’ signal or HIGH-to-LOW transition of pin CHI. After a level change on any of the inputs D0 to D7 (content of new register into ‘old’ register), pin CHI will indicate this event. Reading the ‘old’ register has no influence on any latch content. Reading the new register will shift the content into the old register. During the I2C-bus read sequence of the new register the latch content will be shifted into the corresponding old latch and afterwards the new latches are enabled until the next change on this input. The functions of the inputs D0 to D7 are shown in Table 1. Table 1 A status I2C-bus read sequence resets the status register and pin CHI. Only after a change on any of the inputs D0 to D7, an I2C-bus read sequence of the status register, old register and new register is it necessary to reset pin CHI. The inputs D4 to D7 are maskable via the I2C-bus; see Table 8. All masked inputs (defined via the control register) are blocked to trigger pins CHI and RP. During the disable phase of the masked inputs the corresponding bits within the old and new registers will be continuously refreshed with the actual input level. Input logic levels and functions INPUT SCHMITT TRIGGER INPUT SPECIAL INPUT MASKABLE VL TIMER INTERRUPT IMPEDANCE DETECTION D7 X − X − − D6 X − X − − D5 X − X − − D4 − X X − − D3 − X − − − D2 − X − − − D1 X − − − X D0 X − − X − 2004 Jan 15 7 Philips Semiconductors Product specification On/off logic IC SAA1305T Between detection and indication via the status register bit 6, a delay time is integrated (programmable via the impedance register bits 1 and 0; see Table 15). When the 1⁄ V 2 DD value is detected the EXNOR output will be set to logic 1 (active) and after the programmed delay time the status register bit 6 will be set to logic 1 (active). This event will also be indicated via pin CHI and (if enabled) pin RP. The impedance information (bit 6 is active) within the status register is present until the I2C-bus status is read. With the disappearance of the impedance information no further actions will be generated. Every impedance signal change during the delay time will restart the delay time. However an impedance detection is only possible in the event of a stable signal, at least for the programmed delay time. Setting the status register bit 6 with a repetition time which equals the ‘impedance delay time’ as long as input D1 stays in high-impedance state is implemented. IMPEDANCE DETECTION Input D1 is a normal input with comparable behaviour like the other seven inputs. The only difference is an additional internal exclusive-NOR (EXNOR) connected between the two comparator outputs for high and low detection; see Fig.4. The EXNOR signal indicates, in combination with a special external circuit on input D1, a voltage of 1⁄ V 2 DD on this input. The simple input description for impedance detection is probably not the real solution, but helps to explain the function. Input D1 can be used as a normal input and for impedance detection as described in Table 2. For normal use the output Q acts like every other input, but for impedance detection the EXNOR output S is also important. Output S is linked to the status register bit 6 and indicates the 1⁄2VDD; see Table 5. handbook, full pagewidth 12 V 5V O1 ignition key 10 kΩ 100 kΩ input D1 3.5 V S Q R 100 kΩ O2 S 1.5 V MGR203 Fig.4 Simple input description for impedance detection. Table 2 Logic levels for impedance detection IGNITION KEY 12 V O1 O2 Q S 1 0 1 0 Open-circuit (VI = 2.5 V) 0 0 0 or 1 1 Ground (VI < 1.5 V) 0 1 0 0 2004 Jan 15 8 Philips Semiconductors Product specification On/off logic IC SAA1305T Watchdog timer After the HIGH-to-LOW transition of the reset pulse output, the first transition change within 500 ms on pin WD will be detected as the first trigger from the microcontroller. The timing diagram for the Watchdog timer trigger signal is shown in Fig.5. An internal Watchdog timer is active after each reset pulse output and can be triggered via pin WD. In the event of a not specified pulse, a delayed or missing trigger pulse, a reset on pin RP will be the immediate reaction. handbook, halfpage RP WD (1) (2) (3) MGR220 (1) In the event of a not specified, a delayed or missing trigger signal, a reset on pin RP will be the immediate reaction. (2) The maximum time until signal change for first Watchdog timer is 500 ms. (3) The time until next signal change is minimum 200 ms and maximum 300 ms. Fig.5 Watchdog timer trigger timing. Oscillators VL timer Two oscillator types are built-in, a RC oscillator (designed for 32.768 kHz) and a crystal oscillator (32.768 kHz), both with separate pins. For a proper device function an oscillator control circuit is integrated. This circuit supervises the oscillator function and creates a reset and oscillator restart in the event of an oscillator failure. A built-in timer, which can be started with a HIGH-to-LOW transition on pin TS, triggers, after 250 ms, pins RP and CHI and sets pin ON/OFF. The VL timer starts only once after a valid start condition. Default state after a Power-on reset is not active. A VL timer start resets the Watchdog timer. During run time of the VL timer is ON/OFF = LOW, CHI = 3-state and the Watchdog timer is disabled. In the event of an oscillator fault, the event will be indicated after a restart via the status register bit 5. During the oscillator failure phase some outputs remain at a defined level as shown in Table 3. Pin TS is only active during the run mode. During run time of the VL timer the IC remains in the wait mode. Only a HIGH-level signal on input D0 can stop the VL timer in the same way as after 250 ms. In the event of an oscillator fault the IC also enters the run mode but without an influence on the status register bit 2. During the wait mode an influence of the status register via other sources (e.g. timer and inputs) is possible, but a transition from wait mode to run mode is only possible as described above. The RC oscillator accuracy is 5%. When operating with the RC oscillator, pin XTAL2 must be connected to VDD or VSS to minimize the quiescent current. When operating with the crystal oscillator pin OSC2 must be connected to VSS or VDD. 2004 Jan 15 9 Philips Semiconductors Product specification On/off logic IC SAA1305T Power-on or system reset After the system reset (rising edge on pin RES) all internal registers are in a defined condition (see Table 4) and the outputs are as shown in Table 3 for RES = HIGH. The reset input (pin RES) is of the CMOS input levels type. During a LOW level on pin RES the outputs are as shown in Table 3 for RES = LOW. Table 3 Logic levels for the reset input and oscillator failure PIN RP RES = LOW HIGH RES = HIGH HIGH (voltage on VDD) 3-state [after a defined time (maximum reset time)] OSCILLATOR FAILURE 3-state ON/OFF LOW HIGH LOW LED LOW LOW LOW SDA 3-state 3-state (receiving mode if RP = LOW) 3-state CHI 3-state LOW (information for microcontroller) LOW Table 4 Defined condition after reset for the registers; RES = HIGH REGISTER CONTENTS Status register 02 (HEX) New register all input latches are enabled Old register same levels as corresponding inputs during falling edge on pin RES Control register 03 (HEX) LED register 04 (HEX) Alarm register FFFF (HEX); see Table 7 Watch register 0000 (HEX) Impedance register 03 (HEX) 2004 Jan 15 10 Philips Semiconductors Product specification On/off logic IC SAA1305T To terminate the stream of bytes, the master must not acknowledge the last byte output, but must generate a STOP condition. The output data is from consecutive byte addresses, with the internal byte address counter automatically incremented after each byte output. In the event of higher read sequences than available data bytes, the 7th and 8th bit content are 0 and the address counter will generate a wrap around (output at address 0). I2C-BUS INTERFACE COMMANDS I2C-bus communication is only possible in the run mode. Read mode operations Only the sequential read mode is possible. The IC starts after every device select (code 48) to output data 1. However, in this event the master does acknowledge the data output and the IC continues to output the next data in sequence; see Figs 6 and 7. handbook, full pagewidth S START condition acknowledge acknowledge DEVICE SELECT The definitions of the bits are given in Tables 5, 6 and 7. acknowledge DATA 1 no acknowledge DATA N P STOP condition R/W MGR221 Fig.6 I2C-bus read mode sequence. handbook, full pagewidth START DEVICE SELECT STATUS OLD NEW WATCH byte 0 1 2 3, 4, 5, 6, 7 Fig.7 I2C-bus read data sequence. 2004 Jan 15 11 STOP MGR222 Philips Semiconductors Product specification On/off logic IC Table 5 SAA1305T Definition of the status register bits BIT DESCRIPTION 7 a logic 1 indicates a change on any of the inputs D7 to D0 6 a logic 1 indicates a 1⁄2VDD on input D1 (impedance detection) 5 a logic 1 indicates a reset after an oscillator fault 4 a logic 1 indicates a reset caused by a missed I2C-bus communication after a change information signal (no communication between two Watchdog timer trigger pulses) 3 a logic 1 indicates a timer alarm 2 a logic 1 indicates a VL timer reset 1 a logic 1 indicates a device reset (via pin RES) 0 a logic 1 indicates a Watchdog timer reset Table 6 Definition of the old and new register bits BIT DESCRIPTION 7 data of input D7 6 data of input D6 5 data of input D5 4 data of input D4 3 data of input D3 2 data of input D2 1 data of input D1 0 data of input D0 Table 7 Definition of the watch and alarm register bits (read mode); note 1 ADDRESS (HEX) DATA BITS 2 4 to 0 3 5 to 0 4 DESCRIPTION VALUES DEFAULT hours of alarm 0 to 31 31 minutes of alarm 0 to 63 63 5 to 0 seconds of alarm 0 to 63 63 5 4 to 0 hours of watch 0 to 23 0 6 5 to 0 minutes of watch 0 to 59 0 7 5 to 0 seconds of watch 0 to 59 0 Note 1. The alarm is disabled by writing a time larger than 24:00:00. With the default values the alarm function is disabled. 2004 Jan 15 12 Philips Semiconductors Product specification On/off logic IC SAA1305T Write mode operations The transfer is terminated when the master generates a STOP condition. In the event of a wrong address decoding the IC sends a no acknowledge signal and ignores all following data. After a START condition the master sends a device select code with the R/W bit reset to logic 0; see Fig.8. The IC acknowledge this and waits for the address byte. After the address the master sends the corresponding data, which is acknowledged by the IC. It is possible to continue with the data transfer, each byte is acknowledged by the IC. The internal byte address counter is incremented after each data transmission. acknowledge handbook, full pagewidth S DEVICE SELECT START condition Figure 9 shows the sequence for write data mode. Both alarm and watch registers consist of 3 bytes. The first byte (2 and 5) is the most significant byte. The definitions of the bits are given in Tables 8, 10, 14 and 15. acknowledge ADDRESS acknowledge acknowledge DATA 1 acknowledge DATA N R/W P MGR223 STOP condition Fig.8 I2C-bus write mode sequence. handbook, full pagewidth START DEVICE SELECT ADDRESS CONTROL LED ALARM WATCH IMPEDANCE byte 0 1 2, 3, 4 5, 6, 7 8 Fig.9 I2C-bus write data sequence. 2004 Jan 15 13 STOP MGR224 Philips Semiconductors Product specification On/off logic IC Table 8 SAA1305T 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 VSS; a logic 1 sets pin ON/OFF to VDD 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 Table 12 Control bits for the blink LED frequency BIT 3 BIT 2 PULSE WIDTH (ms) BIT 3 BIT 2 FREQUENCY 0 0 20 0 0 2 Hz (0.5 s) 0 1 10 0 1 1 Hz (1 s) 1 0 5 1 0 0.67 Hz (1.5 s) 1 1 1 1 1 0.5 Hz (2 s) Table 10 Definition of the LED register bits BIT 7 Table 13 Control bits for the blink LED duration time DESCRIPTION BIT 1 BIT 0 DURATION TIME (ms) bits 7 and 6 are function control bits; see Table 11 0 0 20 6 0 1 30 5 no function 1 0 40 1 1 50 I2C-bus 4 reset 3 bits 3 and 2 are control bits for the blink LED frequency (output LOW time); see Table 12 2 1 0 error counter bits 1 and 0 are control bits for the blink LED duration time; see Table 13 Table 11 Function control bits BIT 7 BIT 6 0 0 LED output switched to ground 0 1 blink function according the LED register bits 0 to 3 1 0 LED output switched to VDD 1 1 blink function according the LED register bits 0 to 3 2004 Jan 15 FUNCTION 14 Philips Semiconductors Product specification On/off logic IC SAA1305T Table 14 Definition of the watch and alarm register bits (write mode); notes 1, 2 and 3 ADDRESS (HEX) DATA BITS 2 4 to 0 3 DESCRIPTION VALUES DEFAULT hours of alarm 0 to 31 31 5 to 0 minutes of alarm 0 to 63 63 4 5 to 0 seconds of alarm 0 to 63 63 5 4 to 0 hours of watch 0 to 23 0 6 5 to 0 minutes of watch 0 to 59 0 7 5 to 0 seconds of watch 0 to 59 0 Notes 1. The alarm is disabled by writing a time larger than 24:00:00. With the default values the alarm function is disabled. The alarm is also disabled if hours >23 or minutes >59 or seconds >59. 2. There are several attention points if a senseless time is written to the alarm register, for example: a) Write 25 to address 2; data bits 4 to 0 = 25 ⇒ hours = 25 (alarm disabled). b) Write 70 to address 3; data bits 5 to 0 = 6 ⇒ minutes = 6. c) Write 81 to address 4; data bits 5 to 0 = 17 ⇒ seconds = 17. 3. There are several attention points if a senseless time is written to the watch register, for example: a) Write 25 to address 5; data bits 4 to 0 = 25 ⇒ hours = 23 (limited). b) Write 70 to address 6; data bits 5 to 0 = 6 ⇒ minutes = 6. c) Write 81 to address 7; data bits 5 to 0 = 17 ⇒ seconds = 17. Table 15 Definition of the impedance register bits BIT DESCRIPTION 7 no function 6 no function 5 no function 4 no function 3 no function 2 enable or disable bit for the impedance detection 0 = inactive (1⁄2VDD detection without influence on the status register) 1 = active (1⁄2VDD detection with influence on the status register) 1 bits 1 and 0 are control bits for the impedance detection delay time; see Table 16 0 Table 16 Control bits for the impedance detection delay time BIT 1 BIT 0 DELAY TIME 0 0 100 ms 0 1 250 ms 1 0 500 ms 1 1 1s 2004 Jan 15 15 Philips Semiconductors Product specification On/off logic IC SAA1305T LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 60134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VDD supply voltage operating −0.5 +6.5 V Iq quiescent supply current VDD = 5 V; standby mode − 200 µA VI(n) input voltage on pins fosc = 32 kHz −0.5 +6.5 V with 5 kΩ series resistor −0.5 +17 V fosc = 32 kHz −0.5 +6.5 V SDA, SCL, RES, WD and TS D0 to D7 VO(n) output voltage on pins CHI, RP, ON/OFF and LED fSCL(max) maximum SCL clock frequency − 400 kHz Tvj virtual junction temperature − 150 °C Tstg storage temperature −65 +150 °C Tamb ambient temperature −40 +85 °C THERMAL CHARACTERISTICS SYMBOL Rth(j-a) PARAMETER thermal resistance from junction to ambient CONDITIONS VALUE UNIT 78 K/W in free air CHARACTERISTICS VDD = 5 V; Tamb = 25 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply VDD supply voltage operating 4.5 5.0 5.5 V Iq quiescent supply current note 1 − 130 200 µA Inputs PINS D0 TO D7 Vi(clamp) input clamping voltage Iclamp = 2 mA 5.5 6.5 8.3 V Iclamp(h) high clamping current VD0 to VD7 >VDD − − 2 mA ILI input leakage current VDx = 5 V − − 1 µA 3.4 3.5 3.6 V SCHMITT TRIGGER INPUTS FOR PINS D0, D1 AND D5 TO D7 Vth(r) rising threshold voltage Vth(f) falling threshold voltage 1.4 1.5 1.6 V Vhys hysteresis voltage 1.8 2 2.2 V SPECIAL INPUTS FOR PINS D2, D3 AND D4 Vth(r) rising threshold voltage 2.4 2.5 2.6 V Vth(f) falling threshold voltage 1.7 1.8 1.9 V Vhys hysteresis voltage 0.5 0.7 0.9 V 2004 Jan 15 16 Philips Semiconductors Product specification On/off logic IC SYMBOL SAA1305T PARAMETER CONDITIONS MIN. TYP. MAX. UNIT PIN SCL VIL LOW-level input voltage 0 − 1.5 V VIH HIGH-level input voltage 3 − VDD V ILI input leakage current − − 1 µA fSCL(max) maximum SCL clock frequency − − 400 kHz ti(r) input rise time − tbf − µs ti(f) input fall time − tbf − µs Ci input capacitance − − 7 pF 0 − 0.2VDD V Vi = 5 V; with output off PINS RES, WD AND TS VIL LOW-level input voltage VIH HIGH-level input voltage ILI input leakage current Ci input capacitance Vi = 5 V; with output off 0.8VDD − VDD V − − 1 µA − − 7 pF Inputs/outputs PIN SDA VIL LOW-level input voltage 0 − 1.5 V VIH HIGH-level input voltage 3 − VDD V VOL LOW-level output voltage IOL = 3 mA 0 − 1 V Vi = 5 or 0 V Ioff 3-state off current − − 10 µA ti(r) input rise time − − 2 µs ti(f) input fall time − − 2 µs to(f) output fall time − − 200 ns Ci input capacitance 1 V ≤ Vi ≤ 3 V − − 7 pF CL load capacitance − − 400 pF CRYSTAL OSCILLATOR; notes 2 and 3; see Fig.10 Pdr drive level power − 10 − µW CL load capacitance − 7 to 12 − pF Rs series resistance − 40 − kΩ fosc oscillator frequency − 32.768 − kHz Q Q factor − 40000 100000 RC OSCILLATOR; note 4; see Fig.11 Cosc oscillator capacitance 100 300 − pF Rosc oscillator resistance 5 90 − kΩ fosc oscillator frequency Cosc = 300 pF; Rosc = 90 kΩ; note 5 − 32.768 − kHz fclk(min) minimum clock frequency note 6 − − 10 kHz 2004 Jan 15 17 Philips Semiconductors Product specification On/off logic IC SYMBOL SAA1305T PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Outputs PIN LED 0 − 0.5 V IOL = 16 mA 4 − VDD V VOH > 1 V −20 − − mA VOL LOW-level output voltage IOL = 16 mA VOH HIGH-level output voltage IOH HIGH-level output current PIN ON/OFF VOL LOW-level output voltage IOL = 4 mA 0 − 0.5 V VOH HIGH-level output voltage IOH = −600 µA 4.8 − VDD V IOH = −4 mA 4 − VDD V PIN CHI VOL LOW-level output voltage IOL = 200 µA 0 − 0.5 V ILO output leakage current VOH = VDD − − 5 µA VOH HIGH-level output voltage IOH = −4 mA 4 − VDD V Ioff 3-state off current Vo = VDD or VSS − − 5 µA PIN RP Notes 1. The IC is programmed to standby mode via the I2C-bus command, no LED is connected, no I2C-bus communication, one oscillator is running and the Watchdog timer is disabled. 2. When running on crystal oscillator, the input of the RC oscillator must be connected to VDD or VSS. 3. Preferable crystal types: MU206S and DMX38. 4. When running on RC oscillator, the input of the crystal oscillator must be connected to VDD or VSS. 0.87 5. The RC oscillator frequency f osc = -----------------------------R osc × C osc The RC oscillator frequency tolerance ∆f osc = 2 6. Below this maximum value the IC will detect an oscillator fault. 2004 Jan 15 2 ∆R osc + ∆C osc + ( 0.05 × f osc ) 18 2 Philips Semiconductors Product specification On/off logic IC SAA1305T APPLICATION CIRCUITS VDD handbook, full pagewidth R4 1 kΩ input D7 input D4 1 2 3 4 5 6 7 8 R3 25 kΩ R1 33 kΩ 24 23 9 SAA1305T 12 18 20 R2 20 kΩ 11 10 21 19 22 R5 1 kΩ 16 17 14 15 13 (1) C2 15 pF C1 15 pF MGR204 (1) Crystal oscillator type MU206S (32.768 kHz). Fig.10 Application circuit for crystal oscillator. VDD handbook, full pagewidth R4 4.7 kΩ input D7 input D4 R3 25 kΩ R1 33 kΩ R2 20 kΩ 1 2 3 4 5 6 7 8 24 23 9 SAA1305T 12 18 20 11 10 21 19 22 R5 1 kΩ 16 17 14 15 13 Rosc 90 kΩ Cosc 300 pF MGR205 Fig.11 Application circuit for RC oscillator. 2004 Jan 15 19 Philips Semiconductors Product specification On/off logic IC SAA1305T ON/OFF LOGIC WITH MICROCONTROLLER IN POWER-DOWN STATE 14 V handbook, full pagewidth 5V CONTINUOUS REGULATOR 5V RES 21 ON/OFF 9 10 RP 23 WD 11 SAA1305T 24 D0 to D7 SDA 18 1 to 8 MICROCONTROLLER CHI SCL 20 MGR206 Fig.12 Block diagram with continuous microcontroller supply. handbook, full pagewidth 14 V RES Dx ON/OFF RP CHI ON/OFF RP CHI WD WD (1) (1) MGR207 a. First power-on. b. Normal switch-on. (1) Level not defined. Fig.13 Timing diagrams with continuous microcontroller supply. 2004 Jan 15 20 Philips Semiconductors Product specification On/off logic IC SAA1305T Scenarios for ON/OFF logic with microcontroller in power-down state 5 V continuous handbook, full pagewidth SAA1305T regulator microcontroller RES = LOW RP = HIGH 220 ms (hardware specific) RES = HIGH ON/OFF = HIGH (A/D supply) CHI = LOW 20 ms RP = LOW I2C-bus read status/old/new register CHI = HIGH I2C-bus write reset time/blink/LED status I2C-bus write ENABLE-RESET MGR208 Fig.14 Proper first connection on power supply. SAA1305T handbook, full pagewidth Dx microcontroller main supply RP = HIGH ON/OFF = HIGH 1 ms CHI = LOW RP = LOW I2C-bus read status/old/new register CHI = HIGH WD = LOW POWER-ON 250 ms WD = HIGH 250 ms WD = LOW MGR209 Fig.15 Switch-on after a valid input change. 2004 Jan 15 21 Philips Semiconductors Product specification On/off logic IC handbook, full pagewidth SAA1305T SAA1305T microcontroller main supply POWER-OFF input D0 = LOW TS = LOW 250 ms ON/OFF = LOW RP = HIGH CHI = LOW 1 ms ON/OFF = HIGH RP = LOW I2C-bus read status register CHI = HIGH TS = LOW 250 ms ON/OFF = LOW sequence runs untill signal input D0 = HIGH RP = HIGH CHI = LOW 1 ms ON/OFF = HIGH RP = LOW MGR210 Fig.16 VL timer behaviour (voltage drops >250 ms). handbook, full pagewidth SAA1305T microcontroller main supply POWER-OFF input D0 = LOW TS = LOW t < 250 ms input D0 = HIGH ON/OFF = LOW RP = HIGH CHI = LOW 1 ms ON/OFF = HIGH RP = LOW I2C-bus read status/old/new register CHI = HIGH WD = LOW 250 ms WD = HIGH POWER-ON 250 ms WD = LOW MGR211 Fig.17 VL timer behaviour (voltage drops <250 ms). 2004 Jan 15 22 Philips Semiconductors Product specification On/off logic IC handbook, full pagewidth SAA1305T SAA1305T microcontroller main supply I2C-bus write alarm timer I2C-bus write ENABLE-RESET programmable time POWER-OFF ON/OFF = LOW (A/D supply is off) RP = HIGH ON/OFF = HIGH (A/D supply is on) 1 ms CHI = LOW RP = LOW I2C-bus read status/old/new register CHI = HIGH Watchdog timer trigger sequence(1) POWER-ON MGR212 (1) See Fig.5. Fig.18 Wake-up via alarm. handbook, full pagewidth SAA1305T input Dx 0 to 300 ms 0 to 300 ms microcontroller main supply CHI = LOW WD = HIGH (LOW) WD = LOW (HIGH) POWER-OFF RP = HIGH 1 to 20 ms RP = LOW MGR213 Fig.19 Behaviour after missed I2C-bus read sequence. 2004 Jan 15 23 Philips Semiconductors Product specification On/off logic IC SAA1305T ON/OFF LOGIC WITH SWITCHED MICROCONTROLLER SUPPLY 14 V handbook, full pagewidth 5V CONTINUOUS REGULATOR 5V RES 21 9 ON/OFF 10 SAA1305T 23 RP RESET MICROCONTROLLER CHI 24 1 to 8 5V WD 11 D0 to D7 5V REGULATOR SDA 18 SCL 20 MGR214 Fig.20 Block diagram with switched microcontroller supply. handbook, full pagewidth 14 V RES Dx ON/OFF ON/OFF RP RP CHI CHI WD WD (1) (1) MGR215 a. First power-on. b. Normal switch-on. (1) Level not defined. Fig.21 On/off description with switched microcontroller supply. 2004 Jan 15 24 Philips Semiconductors Product specification On/off logic IC SAA1305T Scenarios for ON/OFF logic with switched microcontroller supply 5 V continuous handbook, full pagewidth SAA1305T regulator 5 V regulator RES = LOW microcontroller RP = HIGH 200 ms RES = HIGH ON/OFF = HIGH RESET = HIGH 6 ms 20 ms CHI = LOW RESET = LOW RP = LOW I2C-bus read status/old/new register CHI = HIGH I2C-bus write reset time/blink/LED status I2C-bus write ENABLE-RESET ON/OFF = LOW RESET = HIGH MGR216 Fig.22 Proper first connection on power supply. handbook, full pagewidthSAA1305T Dx 5 V regulator microcontroller RP = HIGH ON/OFF = HIGH RESET = HIGH RESET = LOW 10 ms 6 ms CHI = LOW RP = LOW I2C-bus read status/old/new register CHI = HIGH WD = LOW 250 ms WD = HIGH 250 ms WD = LOW MGR217 Fig.23 Switch-on after a valid input change. 2004 Jan 15 25 Philips Semiconductors Product specification On/off logic IC handbook, full pagewidth SAA1305T SAA1305T 5 V regulator microcontroller input D0 = LOW 25 ms TS = LOW 250 ms ON/OFF = LOW RESET = HIGH RP = HIGH CHI = LOW 10 ms ON/OFF = HIGH RP = LOW input D0 = HIGH(1) I2C-bus read status/old/new register CHI = HIGH WD = LOW 250 ms WD = HIGH 250 ms WD = LOW MGR218 (1) If input D0 = LOW, the microcontroller will restart the VL timer. Fig.24 VL timer behaviour. SAA1305T handbook, full pagewidth 5 V regulator microcontroller wrong or missed Watchdog timer trigger signal RP = HIGH 1 to 20 ms RP = LOW 300 ms CHI = LOW wrong or missed Watchdog timer trigger signal 4 times RP = HIGH 1 to 20 ms RP = LOW 300 ms wrong or missed Watchdog timer trigger signal ON/OFF = LOW MGR219 Fig.25 Wrong or missed Watchdog timer trigger. 2004 Jan 15 26 Philips Semiconductors Product specification On/off logic IC SAA1305T PACKAGE OUTLINE SO24: plastic small outline package; 24 leads; body width 7.5 mm SOT137-1 D E A X c HE y v M A Z 13 24 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 12 e detail X w M bp 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y mm 2.65 0.3 0.1 2.45 2.25 0.25 0.49 0.36 0.32 0.23 15.6 15.2 7.6 7.4 1.27 10.65 10.00 1.4 1.1 0.4 1.1 1.0 0.25 0.25 0.1 0.01 0.019 0.013 0.014 0.009 0.61 0.60 0.30 0.29 0.05 0.419 0.043 0.055 0.394 0.016 inches 0.1 0.012 0.096 0.004 0.089 0.043 0.039 0.01 0.01 Z (1) 0.9 0.4 0.035 0.004 0.016 θ Note 1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT137-1 075E05 MS-013 2004 Jan 15 JEITA EUROPEAN PROJECTION ISSUE DATE 99-12-27 03-02-19 27 o 8 o 0 Philips Semiconductors Product specification On/off logic IC SAA1305T SOLDERING Wave soldering Introduction to soldering surface mount packages Conventional single wave soldering is not recommended for surface mount devices (SMDs) or printed-circuit boards with a high component density, as solder bridging and non-wetting can present major problems. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our “Data Handbook IC26; Integrated Circuit Packages” (document order number 9398 652 90011). To overcome these problems the double-wave soldering method was specifically developed. There is no soldering method that is ideal for all surface mount IC packages. Wave soldering can still be used for certain surface mount ICs, but it is not suitable for fine pitch SMDs. In these situations reflow soldering is recommended. If wave soldering is used the following conditions must be observed for optimal results: • Use a double-wave soldering method comprising a turbulent wave with high upward pressure followed by a smooth laminar wave. Reflow soldering • For packages with leads on two sides and a pitch (e): Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. Driven by legislation and environmental forces the worldwide use of lead-free solder pastes is increasing. – larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be parallel to the transport direction of the printed-circuit board; – smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the transport direction of the printed-circuit board. Several methods exist for reflowing; for example, convection or convection/infrared heating in a conveyor type oven. Throughput times (preheating, soldering and cooling) vary between 100 and 200 seconds depending on heating method. The footprint must incorporate solder thieves at the downstream end. • For packages with leads on four sides, the footprint must be placed at a 45° angle to the transport direction of the printed-circuit board. The footprint must incorporate solder thieves downstream and at the side corners. Typical reflow peak temperatures range from 215 to 270 °C depending on solder paste material. The top-surface temperature of the packages should preferably be kept: During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. • below 225 °C (SnPb process) or below 245 °C (Pb-free process) – for all BGA, HTSSON-T and SSOP-T packages Typical dwell time of the leads in the wave ranges from 3 to 4 seconds at 250 °C or 265 °C, depending on solder material applied, SnPb or Pb-free respectively. – for packages with a thickness ≥ 2.5 mm – for packages with a thickness < 2.5 mm and a volume ≥ 350 mm3 so called thick/large packages. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. • below 240 °C (SnPb process) or below 260 °C (Pb-free process) for packages with a thickness < 2.5 mm and a volume < 350 mm3 so called small/thin packages. Manual soldering Moisture sensitivity precautions, as indicated on packing, must be respected at all times. Fix the component by first soldering two diagonally-opposite end leads. Use a low voltage (24 V or less) soldering iron applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C. 2004 Jan 15 28 Philips Semiconductors Product specification On/off logic IC SAA1305T Suitability of surface mount IC packages for wave and reflow soldering methods SOLDERING METHOD PACKAGE(1) WAVE REFLOW(2) BGA, HTSSON..T(3), LBGA, LFBGA, SQFP, SSOP..T(3), TFBGA, USON, VFBGA not suitable suitable DHVQFN, HBCC, HBGA, HLQFP, HSO, HSOP, HSQFP, HSSON, HTQFP, HTSSOP, HVQFN, HVSON, SMS not suitable(4) suitable PLCC(5), SO, SOJ suitable suitable not recommended(5)(6) suitable SSOP, TSSOP, VSO, VSSOP not recommended(7) suitable CWQCCN..L(8), PMFP(9), WQCCN..L(8) not suitable LQFP, QFP, TQFP not suitable Notes 1. For more detailed information on the BGA packages refer to the “(LF)BGA Application Note” (AN01026); order a copy from your Philips Semiconductors sales office. 2. All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the maximum temperature (with respect to time) and body size of the package, there is a risk that internal or external package cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). For details, refer to the Drypack information in the “Data Handbook IC26; Integrated Circuit Packages; Section: Packing Methods”. 3. These transparent plastic packages are extremely sensitive to reflow soldering conditions and must on no account be processed through more than one soldering cycle or subjected to infrared reflow soldering with peak temperature exceeding 217 °C ± 10 °C measured in the atmosphere of the reflow oven. The package body peak temperature must be kept as low as possible. 4. These packages are not suitable for wave soldering. On versions with the heatsink on the bottom side, the solder cannot penetrate between the printed-circuit board and the heatsink. On versions with the heatsink on the top side, the solder might be deposited on the heatsink surface. 5. If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave direction. The package footprint must incorporate solder thieves downstream and at the side corners. 6. Wave soldering is suitable for LQFP, TQFP and QFP packages with a pitch (e) larger than 0.8 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm. 7. Wave soldering is suitable for SSOP, TSSOP, VSO and VSSOP packages with a pitch (e) equal to or larger than 0.65 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm. 8. Image sensor packages in principle should not be soldered. They are mounted in sockets or delivered pre-mounted on flex foil. However, the image sensor package can be mounted by the client on a flex foil by using a hot bar soldering process. The appropriate soldering profile can be provided on request. 9. Hot bar or manual soldering is suitable for PMFP packages. 2004 Jan 15 29 Philips Semiconductors Product specification On/off logic IC SAA1305T DATA SHEET STATUS LEVEL DATA SHEET STATUS(1) PRODUCT STATUS(2)(3) Development DEFINITION I Objective data II Preliminary data Qualification This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. III Product data This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Production This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. Notes 1. Please consult the most recently issued data sheet before initiating or completing a design. 2. The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. 3. For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status. DEFINITIONS DISCLAIMERS Short-form specification The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Life support applications These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Limiting values definition Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Right to make changes Philips Semiconductors reserves the right to make changes in the products including circuits, standard cells, and/or software described or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no licence or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Application information Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. 2004 Jan 15 30 Philips Semiconductors Product specification On/off logic IC SAA1305T PURCHASE OF PHILIPS I2C COMPONENTS Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the components in the I2C system provided the system conforms to the I2C specification defined by Philips. This specification can be ordered using the code 9398 393 40011. 2004 Jan 15 31 Philips Semiconductors – a worldwide company Contact information For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825 For sales offices addresses send e-mail to: [email protected]. SCA76 © Koninklijke Philips Electronics N.V. 2004 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands R32/02/pp32 Date of release: 2004 Jan 15 Document order number: 9397 750 12586