STM1068
Smart voltage supervisor
Features
■ ■ ■ ■ ■ ■ ■ ■ ■
Operating voltage 2.7 V to 5.5 V Supply current of 1.5 µA (typ) Factory-trimmed voltage threshold from 3.2 V to 3.5 V in 50 mV increments 3% voltage threshold accuracy across temperature Enable and inhibit inputs (EN, INH) Power supply transient immunity Current limited output of 15 mA (max) Available in flip chip 8-bump package Operating temperature –30°C to +85°C
Flip chip (8-bump)
Applications
■ ■ ■ ■ ■ ■ ■
Portable devices Cell phones/smart phones PDA Palmtops Organizers Portable audio/video players Portable terminals
May 2008
Rev 6
1/22
www.st.com 1
Contents
STM1068
Contents
1 2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 2.2 2.3 2.4 Output, OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Enable input, EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Inhibit input, INH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Pass gate, PKX and POX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 4 5 6 7 8 9
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Package marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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STM1068
List of tables
List of tables
Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Truth table for output, OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Truth table for pass gate between PKX and POX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Flip chip 8-bump, package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Factory-trimmed thresholds with marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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List of figures
STM1068
List of figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8-bump flip chip connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Supply current vs. supply voltage, VEN = 4 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Supply current vs. temperature, VEN = 4 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Supply current vs. supply voltage, VEN = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Supply current vs. temperature, VEN = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Rising voltage detector threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Threshold hysteresis vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Flip chip 8-bump, package mechanical outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Flip chip tape and reel specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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STM1068
Description
1
Description
STM1068 device monitors supply voltage VCC and the state of EN and INH inputs. Depending on logical combination of these inputs, the output OUT is connected to VIN or GND and the pass gate between PKX and POX is either enabled or disabled (see Table 2 and Table 3 for more details). The device offers several voltage thresholds, VTH+ (see Table 9) and it is available in miniature flip chip 8-bump package. Figure 1. Logic diagram
VCC VIN
EN OUT INH PKX STM1068 POX
GND
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Description
STM1068
Table 1.
Pin descriptions
Pin 1A 1B 1C 1D 2A 2B 2C 2D Symbol VIN EN GND PKX OUT INH VCC POX Function Supply for output pin (OUT) Enable from USB VBUS Ground Pass gate input Output Inhibit input Supply voltage Pass gate output
Figure 2.
8-bump flip chip connections
A 1
VIN
B
EN
C
GND
D
PKX
A 2
OUT
B
IN H
C
VCC
D
POX
2
OUT
IN H
VCC
POX
1
VIN
EN
GND
PKX
bottom view, bumps up
top view, bumps down
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STM1068 Figure 3. Block diagram
VIN VCC
Description
Current source GND
Bandgap
+ -
Level shifter LOGIC EN Delay 2µs VCC
OUT
POX 8kV ESD Protection
INH
PKX
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Figure 4.
Hardware hookup
USB charging and transceiver circuits VBAT DC-DC step-up converter VCC EN OUT GND
VBUS USB connector R1
R2
C3
VBOOST
VBAT C1 EN Inhibit control VCC VIN
ASIC
VOUT STM1068 POX INH GND PKX C2
Power key
VCHARGER Power key
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Operation
STM1068
2
Operation
The STM1068 device monitors supply voltage VCC and logic states of EN and INH inputs. According to detected states is the output OUT connected to VIN or GND and the pass gate between PKX and POX is either enabled or disabled (see Table 2, Table 3 , and Figure 11 for more details).
2.1
Output, OUT
If the enable input is in a logic high state and inhibit input is in a logic low state, the output will be connected to VIN input as VCC rises above the VTH+ voltage threshold. Otherwise, the output is connected to ground GND. The output is current limited (see Table 6).
2.2
Enable input, EN
A logic low on the enable input disconnects the output, OUT, from VIN, the POX will follow the PKX and the device enters a standby mode with very low current consumption (see Table 6).
2.3
Inhibit input, INH
A logic high on the inhibit input disconnects the output, OUT, from VIN and the POX will follow the PKX.
2.4
Pass gate, PKX and POX
Pass gate between PKX and POX is disabled only if enable input is in logic high, inhibit input is in logic low and the supply voltage is below the voltage threshold. Table 2.
EN(1) L x x H
Truth table for output, OUT
INH x H x L VCC x x VTH- (falling edge) OUT connected to GND connected to GND connected to GND connected to VIN
1. Once the device is disabled by EN input, the VCC must be above VTH+ to reconnect output to VIN.
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STM1068
Operation
Table 3.
Truth table for pass gate between PKX and POX
EN L x x H INH x H x L VCC x x >VTH+ (rising edge) >VTH- (falling edge)
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