BQ24157S Datasheet, PDF (26/45 Pages) Texas Instruments – Full USB Compliance and USB-OTG Support

Not Recommended for New Designs
bq24157S
SLUSB76B – FEBRUARY 2013 – REVISED MAY 2015
8.5 Register Maps
BIT
B7 (MSB)
B6
B5
B4
B3
B2
B1
B0 (LSB)
Table 4. Status/Control Register (Read or Write)
Memory Location: 00, Reset State: x1xx 0xxx
NAME
Read or Write
FUNCTION
TMR_RST/OTG
Read or Write
Write: TMR_RST function, write 1 to reset the safety timer (auto clear)
Read: OTG pin status
0 – OTG pin at low level
1 – OTG pin at high level
EN_STAT
Read or Write
0 – Disable STAT pin function
1 – Enable STAT pin function (default 1)
STAT2
STAT1
Read only
Read only
00 – Ready
01 – Charge in progress
10 – Charge done
11 – Fault
BOOST
Read only 1 – Boost mode, 0 – Not in boost mode
FAULT_3
FAULT_2
FAULT_1
Read only
Read only
Read only
Charge mode:
000 – Normal
001 – VBUS OVP
010 – Sleep mode
011 – Bad Adaptor or V_BUS < V_UVLO
100 – Output OVP
101 – Thermal shutdown
110 – Timer fault
111 – No battery
Boost mode:
000 – Normal
001 – VBUS OVP
010 – Overload
011 – Battery voltage is too low
100 – Battery OVP
101 – Thermal shutdown
110 – Timer fault
111 – N/A
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Table 5. Control Register (Read or Write)
Memory Location: 01, Reset State: 0011 0000
BIT
B7 (MSB)
B6
B5
B4
B3
B2
B1
B0 (LSB)
NAME
Iin_Limit_2
Iin_Limit_1
V_{(LOWV_2)} ⁽¹⁾
V_{(LOWV_1)} ⁽¹⁾
TE
CE
HZ_MODE
OPA_MODE
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
FUNCTION
00 – USB host with 100-mA current limit
01 – USB host with 500-mA current limit
10 – USB host/charger with 800-mA current limit
11 – No input current limit
Weak battery voltage threshold: 200-mV step (default 1)
Weak battery voltage threshold: 100-mV step (default 1)
1 – Enable charge current termination
0 – Disable charge current termination (default 0)
1 – Charger is disabled
0 – Charger enabled (default 0)
1 – High impedance mode
0 – Not high impedance mode (default 0)
1 – Boost mode
0 – Charger mode (default 0)
(1) The range of the weak battery voltage threshold (V_(LOWV)) is 3.4 to 3.7 V with an offset of 3.4 V and steps of 100 mV (default 3.7 V,
using bits B4 to B5).
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